Relative is now flying around Northern Californian city (3-2-3)
I believe the answer is:
son-in-law
'relative' is the definition.
(son-in-law is a kind of relative)
'is now flying around northern californian city' is the wordplay.
'flying' is an anagram indicator.
'around' means one lot of letters goes inside another.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'californian city' becomes 'la'.
'is'+'now'='isnow'
'isnow' anagrammed gives 'soniw'.
'n'+'la'='nla'
'soniw' placed around 'nla' is 'SON-IN-LAW'.
(Other definitions for son-in-law that I've seen before include "He's married to your daughter" , "Relative by marriage" , "Member of extended family" , "Daughter's husband" .)