Resonant house in city in Gabon (7)
I believe the answer is:
echoing
'resonant' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?
'house in city in gabon' is the wordplay.
'house' becomes 'ho' (abbreviation for house).
'in' is an insertion indicator.
'city' becomes 'EC' (postcode for the City of London).
'gabon' becomes 'g' (this could be a standard abbreviation I've not previously seen).
'ec'+'in'='ecin'
'ho' put inside 'ecin' is 'echoin'.
'echoin'+'g'='ECHOING'
Can you help me to learn more?
(Other definitions for echoing that I've seen before include "Reverberating" , "Copying" , "sending back imitations" , "Resounding" , "Repetition" .)