Con isn't worried receiving a punishment (8)
I believe the answer is:
sanction
'punishment' is the definition.
(I've seen this before)
'con isn't worried receiving a' is the wordplay.
'worried' indicates an anagram.
'receiving' indicates putting letters inside.
'con'+'isnt'='conisnt'
'conisnt' with letters rearranged gives 'snction'.
'snction' placed around 'a' is 'SANCTION'.
(Other definitions for sanction that I've seen before include "Confirm" , "Officially approve" , "Give official approval or attach a penalty to" , "coercive measure" , "Permission or approval as for course of action" .)