More polite with salesman (3)
I believe the answer is:
rep
'salesman' is the definition.
(sales rep)
'more polite with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'REP' can be found hidden inside 'more polite'.
(Other definitions for rep that I've seen before include "agent" , "Repertory theatre" , "Theatre; fabric; salesman" , "Travelling salesman" , "what a draper usually sells" .)