
1) Aspen, at times 2) Coward 3) One quaking 4) One with the shivers 5) Quaker 6) Shaky one 7) Someone showing fear
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https://www.crosswordclues.com/clue/trembler

1) Quaverer
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https://www.crosswordclues.com/clue/trembler

(but see text) | synonyms =Buleites Gistl, 1848 Tremblers are a New World group of passerine birds related to mockingbirds and New World catbirds. Like these, they are in the Mimidae family. There are 2-4 species in one genus, Cinclocerthia: Among the living birds, they are apparently most closely related to the pearly-eyed thrasher. Their common ...
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http://en.wikipedia.org/wiki/Trembler

• (n.) Any of certain West Indian birds of the genera Cinclocerthia and Rhamphocinclus, of the family Mimidae. • (n.) The vibrating hammer, or spring contact piece of a hammer break, as of the electric ignition apparatus for an internal-combustion engine. • (n.) One who trembles.
Found on
http://thinkexist.com/dictionary/meaning/trembler/

A piece of jewellery that has some of its parts set on stiff wires or springs so that they move when they are worn
Found on
http://www.saffronart.com/sitepages/jewelry/glossary.aspx

trembler 1. Someone who quakes and trembles with, or as with, fear. 2. A person who shakes involuntarily; as with fear or cold, shiver. 3. British: an automatic vibrator for making and breaking an electric circuit.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2175/
noun one who quakes and trembles with (or as with) fear
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.