Sport the French must carry over (8)
I believe the answer is:
lacrosse
'sport' is the definition.
(lacrosse is a kind of sport)
'the french must carry over' is the wordplay.
'the french' becomes 'le' ('the' in French).
'must carry' indicates putting letters inside (I've seen this in other clues).
'over' becomes 'across' (synonyms).
'le' going around 'across' is 'LACROSSE'.
(Other definitions for lacrosse that I've seen before include "Sport played with sticks" , "Like thirteen of the other clues in the French" , "Ball game using netted stick" , "Game played with a netted stick" , "Game played with nets on sticks" .)