Grant possibly picked up for cast (3)
I believe the answer is:
hue
'cast' is the definition.
(both can mean the colour of something)
'grant possibly picked up' is the wordplay.
'grant possibly' becomes 'hugh' (actor Hugh Grant).
'picked up' indicates a 'sounds like' (homophone) clue.
'hugh' sounds like 'HUE'.
'for' acts as a link.
(Other definitions for hue that I've seen before include "'Pigment, colour (3)'" , "Delicate shade" , "Tinge" , "Cast" , "complexion" .)