Trace of colour (5)
I believe the answer is:
tinge
'trace of colour' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tinge that I've seen before include "Slight trace; colour" , "Slight colouring" , "show a bit of colour ?" , "Slight tint" , "Small quantity of (differing) colour" .)