Fair sex denied vote, daughter found out (7)
I believe the answer is:
exposed
'found out' is the definition.
'fair sex denied vote daughter' is the wordplay.
'fair' becomes 'expo' (an expo is a type of large exhibition).
'denied' is a deletion indicator (the word is denied some of its letters).
'vote' becomes 'x' (how votes are marked).
'daughter' becomes 'd'.
'sex' with 'x' removed is 'se'.
'expo'+'se'+'d'='EXPOSED'
(Other definitions for exposed that I've seen before include "With no protection or shield" , "Unmasked, revealed" , "Deprived of protection" , "Not covered" , "Without cover" .)