Man acted badly, claiming it provides acceptance (10)
I believe the answer is:
admittance
'acceptance' is the definition.
(thesaurus)
'man acted badly claiming it' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'claiming' is an insertion indicator.
'man'+'acted'='manacted'
'manacted' with letters rearranged gives 'admtance'.
'admtance' enclosing 'it' is 'ADMITTANCE'.
'provides' is the link.
(Other definitions for admittance that I've seen before include "Right to enter" , "gives one the right to be there" , "Letting in" , "Entry" , "What bouncer controls" .)