A yearning for the past (9)
I believe the answer is:
nostalgia
'a yearning for the past' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for nostalgia that I've seen before include "Attraction to the past" , "Fond memories" , "Wistfulness" , "dreaming of the past" , "Sense of past perfect" .)