The French chap at wedding makes space (7)
I believe the answer is:
legroom
'space' is the definition.
(I know that legroom is a type of space)
'the french chap at' is the wordplay.
'the french' becomes 'le' ('the' in French).
'chap at' becomes 'groom' (I can't explain this - if you can you should give a lot more credence to this answer).
'le'+'groom'='LEGROOM'
'wedding makes' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for legroom that I've seen before include "Space to stretch for seated person" , "Space to stretch out when sitting" , "Space often lacking on a plane!" , "(Seated) person's space for feet" , "Space in front of a seat" .)