Give a makeover to clergyman and a politician (6)
I believe the answer is:
revamp
'give a makeover' is the definition.
(I've seen this in another clue)
'clergyman and a politician' is the wordplay.
'clergyman' becomes 'rev' (short for reverend).
'and' is a charade indicator (letters next to each other).
'politician' becomes 'MP' (Member of Parliament).
'rev'+'a'+'mp'='REVAMP'
'to' acts as a link.
(Other definitions for revamp that I've seen before include "get in better shape" , "New and improved version" , "Give makeover to" , "face-lift" , "overhaul" .)