European power limited by genuine revocation (6)
I believe the answer is:
repeal
'revocation' is the definition.
(thesaurus)
'european power limited by genuine' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'power' becomes 'p'.
'limited by' is an insertion indicator (limit can mean to contain or border off).
'genuine' becomes 'real' (associated in meaning).
'e'+'p'='ep'
'ep' put into 'real' is 'REPEAL'.
(Other definitions for repeal that I've seen before include "Countermand" , "Of law, rescind or cancel" , "Revoke, a law say" , "Annul an act of parliament" , "Cancel officially, annul" .)