Bohemian to attend, with family backing (7)
I believe the answer is:
beatnik
'bohemian' is the definition.
(thesaurus)
'attend with family backing' is the wordplay.
'attend' becomes 'beat' (I've seen this in other clues).
'with' says to put letters next to each other.
'family' becomes 'kin' ('kin' can be a synonym of 'family').
'backing' says the letters should be written backwards.
'kin' written backwards gives 'nik'.
'beat'+'nik'='BEATNIK'
'to' is the link.
(Other definitions for beatnik that I've seen before include "Kite ban (anag) -- bohemian" , "Rebellious youth (dated)" , "Nineteen fifty's youth" , "Kite ban (anag) - 1950s' non-conformist" , "Unconventional young scruff" .)