Feathery snake? (3)
I believe the answer is:
boa
'snake?' 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 "feathers around the neck?" , "One with scaly body" , "Feathered neckwear - snake" , "Snake; fur" , "native American" .)