In Napoli, certainly, a force (6)

I believe the answer is:

police

'force' is the definition.
(police force is a kind of force)

'in napoli certainly a' is the wordplay.
'in' indicates a hidden word.
'POLICE' is hidden within 'napoli certainly a'.

(Other definitions for police that I've seen before include "Law enforcers" , "Boys in blue" , "Nick" , "Keep watch on" , "Emergency service" .)

I've seen this clue in the Evening Standard.

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