Sweet on, with "of" (4)
I believe the answer is:
fond
'sweet on with of' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fond that I've seen before include "Keen on; indulgent" , "Affectionate - tender" , "Feeling affection, maybe foolish" , "Affectionate, maybe foolish" , "Partial to" .)