Consenting to adjust a complaint (9)
I believe the answer is:
compliant
'consenting' is the definition.
(thesaurus)
'adjust a complaint' is the wordplay.
'adjust' indicates an anagram.
'complaint' with letters rearranged gives 'COMPLIANT'.
'to' acts as a link.
(Other definitions for compliant that I've seen before include "willing" , "Obliging" , "Conforming, yielding" , "Yielding to pressure" , "Complaint about being obedient" .)