Bit of white, a little colour (4)
I believe the answer is:
teal
'colour' is the definition.
(I know that teal is a type of green)
'bit of white a little' is the wordplay.
'bit of' says the answer is hidden in the clue.
'TEAL' is hidden in the letters of 'white a little'.
(Other definitions for teal that I've seen before include "Dark greenish-blue colour" , "Strange tale of a duck" , "Variety of small ducks" , "Small freshwater duck and colour" , "Species of duck" .)