1) Baby swan 2) French word used in English 3) Name for a young swan 4) Swan 5) Swanling 6) The Ugly Duckling 7) Tiny trumpeter 8) Trumpeter youngster 9) Young aquatic bird 10) Young bird 11) Young cob 12) Young swan Found on https://www.crosswordclues.com/clue/cygnet
(from the article `swan`) ...eggs, on a heap of vegetation, while the cob keeps close guard; in some species he takes his turn at brooding. After repulsing an enemy, swans ... Found on http://www.britannica.com/eb/a-z/c/174
Cyg'net (sĭg'nĕt) noun [ Dim. of French cygne swan, Latin cycnus . cygnus , from Greek ky`klos : but French cygne seems to be an etymological spelling of Old French cisne , from Late Latin cecinus , cicinus , perhaps ultimatel... Found on http://www.encyclo.co.uk/webster/C/210
HMS Cygnet was a British modified Black Swan Class sloop of 1430 tons displacement launched in 1942. HMS Cygnet was powered by two 3-drum type boilers providing a top speed of 20 knots and carried a complement of 192. She was armed with six 4 inch dual purpose guns and eight 2 pdr anti-aircraft guns. Found on http://www.probertencyclopaedia.com/browse/RCA.HTM