Intended one for Resistance in country round Paris (6)
I believe the answer is:
Here is my best explanation:
'intended' is the definition.
'one for resistance in country round paris' is the subsidiary indication.
I cannot quite understand how this works, but
'one' could be 'an' (I've seen this in other clues) and 'an' is present in the answer.
This explanation may well be incorrect...
(Other definitions for fiance that I've seen before include "The man she is going to marry", "One waiting to go to match", "One getting married", "He's engaged to be married", "Male intended", "Prospective groom", "Groom-to-be", "The man she's engaged to", "Betrothed man" and "One promised in marriage".)