Ignore police officers on patrol, it’s said (9)
I believe the answer is:
disregard
'ignore' is the definition.
(I know that ignore can be written as disregard)
'police officers on patrol it's said' is the wordplay.
'police officers' becomes 'dis' (I've seen this in other clues).
'on' becomes 're' ('on' can be mean 'with reference to').
'patrol' becomes 'guard'.
'it's said' shows a homophone (sound like).
'guard' is a homophone of 'gard'.
'dis'+'re'+'gard'='DISREGARD'
(Other definitions for disregard that I've seen before include "Push aside" , "Neglect, ignore" , "Overlook - inattention" .)