Pursued by the police (2,3,3)
I believe the answer is:
on the run
'pursued by the police' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for on the run that I've seen before include "No hunter seen in flight from the law" , "Trying to avoid capture" , "Where bobsleigh competitor is found" , "Having escaped custody" , "astride galloping hunter" .)