I had cut into social occasion, it's clear (7)
I believe the answer is:
evident
'clear' is the definition.
('evident' can be a synonym of 'clear')
'i had cut into social occasion' is the wordplay.
'i had' becomes 'id' (I'd).
'cut into' is an insertion indicator.
'social occasion' becomes 'event' (I've seen this before).
'id' put within 'event' is 'EVIDENT'.
'it's' acts as a link.
(Other definitions for evident that I've seen before include "Plain to see" , "Visible - plain" , "Quite obvious, manifest" , "Quite obvious and clear" , "Clearly discernible" .)