French madame and monsieur have words before ceremony (10)
I believe the answer is:
marguerite
'french madame' is the definition.
(French feminine name)
'monsieur have words before ceremony' is the wordplay.
'monsieur' becomes 'm'.
'have words' becomes 'argue' (to have words with someone is to argue with them).
'before' means one lot of letters go next to another.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'm'+'argue'+'rite'='MARGUERITE'
'and' acts as a link.
(Other definitions for marguerite that I've seen before include "Daisy" , "Girl" , "plant" , "Flower" .)