Musical section in street bands (7)
I believe the answer is:
strings
'musical section' is the definition.
(I've seen this in another clue)
'street bands' is the wordplay.
'street' becomes 'st' (abbreviation).
'bands' becomes 'rings' (ring is a kind of band).
'st'+'rings'='STRINGS'
'in' acts as a link.
(Other definitions for strings that I've seen before include "Just; trade exhibition" , "Orchestral section" , "Undesirable conditions" , "Section of an orchestra that plays violins, cellos" , "Lengths of wire etc on a musical instrument" .)