Sentimental yearning for the past (9)
I believe the answer is:
nostalgia
'sentimental yearning for the past' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nostalgia that I've seen before include "Longing for something past - isn't a goal (anag)" , "severe homesickness" , "Longing for things past" , "Sense of past perfect" , "Fond remembrance" .)