
1) Bird related to the goldfinch 2) British rock music group 3) Carduelis spinus 4) Everyday German animal name 5) Familiar German animal name 6) Finch 7) German animal name 8) Prevalent German animal name 9) Well known bird 
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https://www.crosswordclues.com/clue/siskin

1) Blak-headed goldfinch 2) Barley bird 
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https://www.crosswordclues.com/clue/siskin

 The name siskin when referring to a bird is derived from an adaptation of the German dialect words sisschen, zeischen, which are diminutive forms of Middle High German (zîsec) and Middle Low German (ziseke, sisek) words, which are themselves apparently of Slavic origin. The name siskin was first recorded in written English in 1562, referring to t...
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http://en.wikipedia.org/wiki/Siskin

small finch-like songbird
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http://phrontistery.info/s.html

• (n.) The American pinefinch (S. pinus); -- called also pine siskin. See Pinefinch. • (n.) A small green and yellow European finch (Spinus spinus, or Carduelis spinus); -- called also aberdevine.
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http://thinkexist.com/dictionary/meaning/siskin/

any of about 20 small, brown-streaked birds, marked with yellow, that belong chiefly to the genus Carduelis (including Spinus) of the family ...
Found on 
http://www.britannica.com/eb/a-z/s/102

<zoology> A small green and yellow European finch (Spinus spinus, or Carduelis spinus); called also aberdevine. ... The American pinefinch (S. Pinus); called also pine siskin. See Pinefinch. ... The name is applied also to several other related species found in Asia and South America. Siskin green, a delicate shade of yellowish green, as in t...
Found on 
http://www.encyclo.co.uk/local/20973

Sis'kin  noun [ Danish  sisgen ; confer Swedish  siska , German  zeisig , Dutch  sijsje ; of Slav. origin; confer Pol.  czy... .]  (Zoology)  (a)  A small green and yellow European finch ( Spinus spinus , or  Carduelis spinus ); -- called also 
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http://www.encyclo.co.uk/webster/S/110

The Siskin or Aberdevine (Carduelis Spinus) is a bird which visits England during the winter. It is 11 centimetres long with a black crown, variegated plumage of grey and yellow and a dusky tail. They are to be found in alder trees where they feed on the seeds.
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http://www.probertencyclopaedia.com/browse/BSA.HTM

[
n] - small sharp-billed yellow-and-black Eurasian finch
Found on 
http://www.webdictionary.co.uk/definition.php?query=siskin
 Carduelis spinus noun
Carduelis spinus noun small yellow-and-black Eurasian finch with a sharp beak
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https://www.encyclo.co.uk/local/20974

North American finch 
Carduelis pinus with yellow markings or greenish-yellow bird 
Carduelis spinus about 12 cm/5 in long, found in Eurasia. They are members of the finch family Fringillidae, order Passeriformes
Found on 
https://www.encyclo.co.uk/local/21221
  No exact match found.