Betrays Poles in Italian city (5,2)
I believe the answer is:
turns in
'betrays' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Perhaps you can see a link between them that I don't see?
'poles in italian city' is the wordplay.
'poles' becomes 'NS' (north and south poles).
'in' indicates putting letters inside.
'italian city' becomes 'turin' (Turin is a city in Italy).
'ns' put into 'turin' is 'TURNS-IN'.
Can you help me to learn more?
(Other definitions for turns in that I've seen before include "Retires" , "goes to bed" , "Voluntarily hands over" , "Goes home" .)