A delightful thing recalled in story (4)
I believe the answer is:
saga
'story' is the definition.
(saga is a kind of story)
'a delightful thing recalled' is the wordplay.
'delightful thing' becomes 'gas' (informal term for an amusing thing).
'recalled' is a reversal indicator.
'a'+'gas'='agas'
'agas' in reverse letter order is 'SAGA'.
'in' is the link.
(Other definitions for saga that I've seen before include "Long narrative" , "Norse narrative" , "Epic tale" , "Old story" , "Epic story" .)