Blue or green? (3-6)
I believe the answer is:
off-colour
This clue is a double definition.
'blue' is the first definition.
(I've seen this before)
'green?' is the second definition.
(I've seen this before)
'or' is the link.
(Other definitions for off-colour that I've seen before include "Not in the pink?" , "Slightly unwell" , "Rather poorly" , "Unwell or mildly indecent" , "Not well - looking pale" .)