Reflected sound from City house (4)
I believe the answer is:
echo
'reflected sound' is the definition.
(an echo is a reflected sound)
'city house' is the wordplay.
'city' becomes 'EC' (the City of London postcode).
'house' becomes 'ho' (abbreviation for house).
'ec'+'ho'='ECHO'
'from' acts as a link.
(Other definitions for echo that I've seen before include "She loved Narcissus - it's recalled" , "The distant sound" , "Marked by heat" , "Nymph whose love Narcissus spurned" , "E; reverberation" .)