Club succeeded in promotion of street artist (7)
I believe the answer is:
arsenal
'club' is the definition.
(football club)
'succeeded in promotion of street artist' is the wordplay.
'succeeded' becomes 's' (genealogical abbreviation).
'in' is an insertion indicator.
'promotion of' shows that the letters should be reversed in order (in a down clue, letters go up or get promoted).
'street' becomes 'lane'.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'lane'+'ra'='lanera'
'lanera' backwards is 'arenal'.
's' inserted inside 'arenal' is 'ARSENAL'.
(Other definitions for arsenal that I've seen before include "Football club and military store" , "Weapon store - team" , "Store of weaponry" , "Football club based at Emirates Stadium" , "Depot for arms and other military equipment" .)