Put off supporting scoundrel (8)
I believe the answer is:
prorogue
'put off' is the definition.
(thesaurus)
'supporting scoundrel' is the wordplay.
'supporting' becomes 'pro' (I've seen this in other clues).
'scoundrel' becomes 'rogue' (rogue is a kind of scoundrel).
'pro'+'rogue'='PROROGUE'
(Other definitions for prorogue that I've seen before include "Discontinue meeting" , "Discontinue (a session of parliament)" , "Stop meeting" , "Suspend meeting" , "Suspend, postpone" .)