Upcoming street artist’s drawing in school magazine (7)
I believe the answer is:
arsenal
'magazine' is the definition.
(both can mean an ammunition store)
'upcoming street artist's drawing in school' is the wordplay.
'upcoming' says the letters should be written backwards.
'street' becomes 'lane' (I can't justify this - if you can you should give a lot more credence to this answer).
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'drawing in' is an insertion indicator (draw in can mean to contain or trap).
'school' becomes 'S'.
'lane'+'ra'='lanera'
'lanera' enclosing 's' is 'lanesra'.
'lanesra' backwards is 'ARSENAL'.
Can you help me to learn more?
(Other definitions for arsenal that I've seen before include "Collection of weapons" , "Eleven" , "All a country's weapons" , "London FC" , "Cache of weapons or English soccer team" .)