Colour, shade (3)
I believe the answer is:
hue
I believe this clue is a double definition.
'colour' is the first definition.
(I know that hue is a more specific form of the action colour)
'shade' is the second definition.
(both can mean a colour)
(Other definitions for hue that I've seen before include "'Pigment, colour (3)'" , "Tinge" , "Tone, shade" , "appearance" , "red or black, say" .)