A French maiden poses — and is revealing (7)
I believe the answer is:
unmasks
'is revealing' is the definition.
(to unmask something is to reveal it)
'a french maiden poses' is the wordplay.
'a french' becomes 'un' ('a' in French).
'maiden' becomes 'm' (cricket abbreviation).
'poses' becomes 'asks' (as in posing or asking a question).
'un'+'m'+'asks'='UNMASKS'
'and' acts as a link.
(Other definitions for unmasks that I've seen before include "lays oneself open" , "Exposes, shows up" , "Removes domino" , "Reveals the true nature of" , "Exposes, removes disguise" .)