French city welcomes English family member (5)
I believe the answer is:
niece
'family member' is the definition.
(I know that niece is a type of blood relation)
'french city welcomes english' is the wordplay.
'french city' becomes 'Nice' (Nice is a French city).
'welcomes' is an insertion indicator (in sense of 'invites in').
'english' becomes 'E' (abbreviation as in OED).
'nice' placed around 'e' is 'NIECE'.
(Other definitions for niece that I've seen before include "[PRIEST'S] daughter?" , "member of different generation" , "Female relation" , "Son's cousin" , "Family relation" .)