Area of responsibility (5)
I believe the answer is:
remit
'area of responsibility' is the definition.
(remit can mean one's responsibilities or duties)
This is all the clue.
(Other definitions for remit that I've seen before include "Pardon (a sin)" , "Send (money) by post" , "Send - scope of one's duties" , "Send - terms of reference" , "Scope of prescribed job" .)