Color named for a duck (4)
I believe the answer is:
teal
'color named for a duck' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for teal that I've seen before include "Bluish shade of green" , "Dark green-blue; duck" , "Variety of small ducks" , "Species of duck" , "Small, short-necked duck" .)