Ban of the French kiss in exercise overturned (5)
I believe the answer is:
expel
'ban' is the definition.
(thesaurus)
'the french kiss in exercise overturned' is the wordplay.
'the french' becomes 'le' (**).
'kiss' becomes 'x'.
'in' means one lot of letters goes inside another.
'exercise' becomes 'pe' (Physical Education).
'overturned' is a reversal indicator.
'x' going inside 'pe' is 'pxe'.
'le'+'pxe'='lepxe'
'lepxe' reversed gives 'EXPEL'.
'of' is the link.
(Other definitions for expel that I've seen before include "Drive out - dispossess" , "Discharge in disgrace" , "Oust" , "Drive out - eject" , "Evict" .)