Exercise on street to get troublemaker (4)
I believe the answer is:
pest
'troublemaker' is the definition.
'exercise on street' is the wordplay.
'exercise' becomes 'pe' (Physical Education).
'on street' becomes 'st' (I've seen this in other clues).
'pe'+'st'='PEST'
'to get' is the link.
(Other definitions for pest that I've seen before include "Troublesome person" , "Annoyance" , "Constant nuisance" , "Disease with a high death rate" , "Aphis" .)