Users put on court in island (7)
I believe the answer is:
addicts
'users' is the definition.
(I've seen this in another clue)
'put on court in island' is the wordplay.
'put on' becomes 'add' (I've seen this in another clue).
'court' becomes 'ct' (abbreviation used in road names).
'in' is an insertion indicator.
'island' becomes 'is' (abbreviation).
'ct' placed inside 'is' is 'icts'.
'add'+'icts'='ADDICTS'
(Other definitions for addicts that I've seen before include "Habitual drug users" , "People with compulsive ailments as for drugs" , "Junkies" , "People who are hooked" .)