Cream of the crop (4)
I believe the answer is:
best
'cream of the crop' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for best that I've seen before include "at 16 down [MAN UNITED] ?" , "Top; defeat" , "The finest - worst" , "unbeatable" , "BOSOM] ?" .)