Retribution from Gene after bashing in lead at church (9)
I believe the answer is:
vengeance
'retribution' is the definition.
(synonyms)
'gene after bashing in lead at church' is the wordplay.
'after bashing' indicates anagramming the letters (the letters are bashed or beaten up).
'in' indicates putting letters inside.
'lead' becomes 'van' (van is the leading part of a movement or group).
'at' says to put letters next to each other.
'church' becomes 'CE' (abbreviation for Church of England).
'gene' anagrammed gives 'enge'.
'enge' placed within 'van' is 'vengean'.
'vengean'+'ce'='VENGEANCE'
'from' acts as a link.
(Other definitions for vengeance that I've seen before include "Retribution" , "Retributory punishment" .)