Sequence provided by street band (6)
I believe the answer is:
string
'sequence' is the definition.
(thesaurus)
'by street band' is the wordplay.
'by' means one lot of letters go next to another.
'street' becomes 'st'.
'band' becomes 'ring' ('ring' can be a synonym of 'band').
'st' next to 'ring' is 'STRING'.
'provided' acts as a link.
(Other definitions for string that I've seen before include "Series of events" , "might one be plucked?" , "It's difficult to say how long a piece of it is" , "Thin piece of cord" , "Part of racket" .)