Social occasion’s proud ancestry to some extent (5)
I believe the answer is:
dance
'social occasion's' is the definition.
(I've seen this in another clue)
'proud ancestry to some extent' is the wordplay.
'to some extent' says the answer is hidden in the clue.
'DANCE' is hidden within 'proud ancestry'.
(Other definitions for dance that I've seen before include "tap, say" , "Flamenco, perhaps" , "spin?" , "Reel, say" , "Waltz maybe" .)