Denied being age ten? Wrong daughter (7)
I believe the answer is:
negated
'denied' is the definition.
(I've seen this in another clue)
'age ten? wrong daughter' is the wordplay.
'wrong' indicates an anagram.
'daughter' becomes 'd' (genealogical abbreviation).
'age'+'ten'='ageten'
'ageten' is an anagram of 'negate'.
'negate'+'d'='NEGATED'
'being' is the link.
(Other definitions for negated that I've seen before include "Denied" , "Contradicted" , "Cancelled or destroyed the effect of something" , "Made ineffective" , "Discredited" .)