Dog in street running wild (6)
I believe the answer is:
setter
'dog' is the definition.
(setter is a type of dog)
'street running wild' is the wordplay.
'running wild' is an anagram indicator.
'street' anagrammed gives 'SETTER'.
'in' is the link.
(Other definitions for setter that I've seen before include "Thematic type [DOG]" , "Long-haired dog breed" , "Bird trained to scent game" , "puzzle constructor" , "Puzzle creator" .)