Look back fondly (9)
I believe the answer is:
reminisce
'look back fondly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reminisce that I've seen before include "Recall past events" , "Recollect past events" , "talk about the old days" , "Give account of past" , "Talk about old times - I'm sincere (anag)" .)