Purple-brown (4)
I believe the answer is:
puce
This clue is a double definition.
'purple' is the first definition.
(I've seen this in another clue)
'brown' is the second definition.
(I know that puce is a type of brown)
(Other definitions for puce that I've seen before include "Purplish-brown colour" , "Deep red to brownish purple" , "Purplish colour" , "Dark red or purple-brown colour" , "Shade" .)