Returned calls from city dwellings miles away (6)
I believe the answer is:
echoes
'returned calls from' is the definition.
I can't tell whether this definition defines the answer.
'city dwellings miles away' is the wordplay.
'city' becomes 'ec' (the City of London postcode).
'dwellings' becomes 'homes' ('home' can be a synonym of 'dwelling').
'miles' becomes 'm' (common abbreviation).
'away' indicates named letters should be taken away.
'homes' with 'm' taken out is 'hoes'.
'ec'+'hoes'='ECHOES'
Can you help me to learn more?
(Other definitions for echoes that I've seen before include "They're heard coming back" , "Sounds reverberating" , "Resounds, reverberates" , "Repeats" , "Sound reverberations" .)