Habit of priest in a suburb of Mumbai (7)
I believe the answer is:
apparel
'habit' is the definition.
(thesaurus)
'priest in a suburb of mumbai' is the wordplay.
'priest' becomes 'pp' (I've seen this in other clues).
'in' is an insertion indicator.
'a' becomes 'area' (maths abbreviation).
'suburb of' suggests removing the centre (I've seen 'suburbs of' mean this (suburbs are the edges of a city)).
'mumbai' becomes 'rel' (I can't justify this - if you can you should believe this answer much more).
'area' with its middle taken out is 'aa'.
'pp' put within 'aa' is 'appa'.
'appa'+'rel'='APPAREL'
'of' is the link.
Can you help me to learn more?
(Other definitions for apparel that I've seen before include "Clothes - garments" , "what's in the press?" , "Formal word for clothing" , "Pod of peas" , "whatever people have on" .)