Setter’s devious ways (7)
I believe the answer is:
'ways' is the definition.
(street is a kind of way)
'setter's devious' is the wordplay.
'devious' indicates an anagram.
'setters' with letters rearranged gives 'STREETS'.
(Other definitions for streets that I've seen before include "Avenues" , "Town thoroughfares" , "significantly ahead?" , "Ways" , "Built-up roads" .)