Crossword Genius

Feathery serpent? (3)

Ross

I believe the answer is:

boa

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'serpent?' is the definition.
(boa constrictor, type of snake)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for boa that I've seen before include "Large S American snake" , "Potential killer" , "Fluffy scarf of feathers" , "native American" , "Long, thin, feathery scarf" .)

I've seen this clue in The Mirror.
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