Escort the woman in old city (5)
I believe the answer is:
usher
'escort' is the definition.
(usher is a kind of escort)
'the woman in old city' is the wordplay.
'the woman' becomes 'she' (I've seen this before).
'in' is an insertion indicator.
'old city' becomes 'ur' (ancient city state).
'she' inserted inside 'ur' is 'USHER'.
(Other definitions for usher that I've seen before include "Theatre attendant" , "Doorkeeper in parliament or 29 down" , "Person whose job is to conduct others" , "One escorts people to seats" , "Person showing one to a seat" .)