Post-war leader emerging from battle energised (6)
I believe the answer is:
attlee
'post-war leader' is the definition.
(I've seen this before)
'emerging from battle energised' is the wordplay.
'emerging from' indicates the answer is hidden within the clue.
'ATTLEE' is hidden within 'battle energised'.
(Other definitions for attlee that I've seen before include "Prime minister, 1945-51" , "5,27 [PRIME MINISTER]" , "Former British PM" , "Clement -, PM nineteen forty five - fifty one" , "British premier" .)