Curse MP - he's able to change... (9)
I believe the answer is:
blaspheme
'curse' is the definition.
('blaspheme' can be a synonym of 'curse')
'mp he's able to change' is the wordplay.
'to change' indicates an anagram.
'mp'+'hes'+'able'='mphesable'
'mphesable' is an anagram of 'BLASPHEME'.
(Other definitions for blaspheme that I've seen before include "Curse profanely" , "Talk irreverently about God and sacred things" , "Say irreverent things about God" , "Speak profanely" , "Curse, profane" .)