Country to support province after reverse (5)
I believe the answer is:
india
'country' is the definition.
(India is an example)
'support province after reverse' is the wordplay.
'support' becomes 'aid' ('aid' can be a synonym of 'support'**).
'province' becomes 'ni' (I've seen this in other clues).
'after' says to put letters next to each other.
'reverse' says the letters should be written in reverse.
'aid'+'ni'='aidni'
'aidni' reversed gives 'INDIA'.
'to' acts as a link.
(Other definitions for india that I've seen before include "The world's most populous democracy" , "home to her Mumbai family" , "New Delhi is its capital" , "where to ring for help?" , "Sub-continental country" .)