Relative's fashionable wife touring city (2-3)
I believe the answer is:
in-law
'relative's' is the definition.
(in-law is a kind of relative)
'fashionable wife touring city' is the subsidiary indication.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'wife' becomes 'w'.
'touring' indicates putting letters inside.
'city' becomes 'la' (Los Angeles).
'in'+'w'='inw'
'inw' enclosing 'la' is 'inlaw'.
(Other definitions for in-law that I've seen before include "Meghan to Harry's family?" , "Relative by marriage" , "Relation by marriage" , "Spouse's relation" , "Near relative" .)