Duck appears from the east without its head (4)
I believe the answer is:
smee
'duck' is the definition.
(type of duck)
I cannot understand how the remainder of the clue works.
(Other definitions for smee that I've seen before include "pirate > BIRD" , "Captain Hook's right-hand man" , "Local duck" , "Captain Hook's mate" , "Simpered oddly" .)