Deep purple (4)
I believe the answer is:
plum
'deep purple' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for plum that I've seen before include "Fruit < that's highly desirable" , "Shade" , "Dark reddish-purple colour: especially valued" , "Fruit; something choice" , "Brilliant" .)