Nerve outing MP that’s unruly (8)
I believe the answer is:
gumption
'nerve' is the definition.
(thesaurus)
'outing mp that's unruly' is the wordplay.
'that's unruly' indicates an anagram.
'outing'+'mp'='outingmp'
'outingmp' with letters rearranged gives 'GUMPTION'.
(Other definitions for gumption that I've seen before include "Fortitude and determination" , "Nous" , "Courage needed!" , "Informal common sense or initiative" , "To impugn (anag) - common sense" .)