Cream on fruit for chief (3,6)
I believe the answer is:
top banana
'chief' is the definition.
(I've seen this in another clue)
'cream on fruit' is the wordplay.
'cream' becomes 'top' (as in the cream of the crop).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'fruit' becomes 'banana' (type of fruit).
'top'+'banana'='TOP BANANA'
'for' is the link.
(Other definitions for top banana that I've seen before include "first on hand?" , "pick of the bunch?" , "figurehead?" , "head" , "leader" .)