Pond duck (4)
I believe the answer is:
teal
'pond duck' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for teal that I've seen before include "Duck - dark greenish-blue" , "Strange tale of a duck" , "Small river duck" , "Dark greenish-blue colour" , "Bluish shade of green" .)