Next door resident found in the locality after the gangster went away (9)
I believe the answer is:
neighbour
'next door resident' is the definition.
'neighbour' can be an answer for 'resident' (I have seen 'Nearby resident ' mean 'neighbour' so perhaps 'resident' could also mean 'neighbour'). I'm not sure about the 'next door' bit.
'the locality after the gangster went away' is the wordplay.
I cannot really understand how this works, but
'locality' could be 'ne' and 'ne' is found in the answer.
This explanation may well be incorrect...
'found in' acts as a link.
Can you help me to learn more?
(Other definitions for neighbour that I've seen before include "Local resident" , "possibly providing part of watch?" , "Such a one might help out" , "Nearby resident" , "One lives nearby" .)