Street mix produces zealot (9)
I believe the answer is:
extremist
'zealot' is the definition.
(I've seen this in another clue)
'street mix produces' is the wordplay.
'produces' indicates an anagram.
'street'+'mix'='streetmix'
'streetmix' anagrammed gives 'EXTREMIST'.
(Other definitions for extremist that I've seen before include "An ultra-radical" , "His views are anything but neutral" , "Far left- or right-winger" , "One with very radical views" , "One with views very far from consensus" .)