Quiet clue about student lacking colour (4)
I believe the answer is:
puce
'colour' is the definition.
(puce is a kind of colour)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for puce that I've seen before include "Purplish colour" , "Pinkish purple" , "Shade" , "Dark red or purple-brown colour" , "Deep red to brownish purple" .)