Live among opponents in French resort (7)
I believe the answer is:
antibes
'french resort' is the definition.
(city on the French Riviera)
'live among opponents' is the wordplay.
'live' becomes 'be' (synonyms).
'among' is an insertion indicator.
'opponents' becomes 'antis' (I've seen this before).
'be' put inside 'antis' is 'ANTIBES'.
'in' is the link.
(Other definitions for antibes that I've seen before include "French port" , "French community" , "French Riviera resort" , "French Mediterranean resort" .)