For each family conflict, gesture old pretender (6,7)
I believe the answer is:
perkin warbeck
'old pretender' is the definition.
'perkin warbeck' can be an answer for 'pretender' (I've seen this before). I'm not certain of the 'old' bit.
'for each family conflict gesture' is the wordplay.
'for each' becomes 'per' (per person).
'family' becomes 'kin' (synonyms).
'conflict' becomes 'war' (war is a kind of conflict).
'gesture' becomes 'beck' (beck is a kind of gesture).
'per'+'kin'+'war'+'beck'='PERKIN WARBECK'
Can you help me to learn more?
(Other definitions for perkin warbeck that I've seen before include "Claimant to throne" , "English pretender" , "Pretender against Henry VII" .)