Bluish shade of green (4)
I believe the answer is:
teal
'bluish shade of green' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for teal that I've seen before include "Dark greenish-blue colour" , "Small freshwater duck and colour" , "Variety of small ducks" , "Strange tale of a duck" , "Duck - dark greenish-blue" .)