Quarrel has bearing on the French (6)
I believe the answer is:
hassle
'quarrel' is the definition.
(I've seen this before)
'has bearing on the french' is the wordplay.
'bearing' becomes 's' ().
'on' is a charade indicator (letters next to each other).
'the french' becomes 'le' ('the' in French).
'has'+'s'+'le'='HASSLE'
(Other definitions for hassle that I've seen before include "Informally, annoy or harass" , "Informally, annoyance or quarrel" , "badger" , "Difficulty - dispute" , "Irritating inconvenience" .)