A longing for the past (9)

I believe the answer is:
nostalgia
'a longing 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 "Remembrance of Things Past" , "Sense of past perfect" , "severe homesickness" , "Sentimental reminiscing of analogist" , "Wistfulness" .)