Police officers fail to notice fire (7)
I believe the answer is:
dismiss
'fire' is the definition.
(I know that dismiss is a type of fire)
'police officers fail to notice' is the wordplay.
'police officers' becomes 'dis' (I've seen this in other clues).
'fail to notice' becomes 'miss' (I've seen this in other clues).
'dis'+'miss'='DISMISS'
(Other definitions for dismiss that I've seen before include "Drop" , "Sack - send away" , "Remove from office" , "Reject, send away" , "Fire - cashier" .)