Lethal force keeps order locally (4)
I believe the answer is:
half
'order locally' is the definition.
(a half-pint might be ordered in one's local pub)
'lethal force keeps' is the wordplay.
'keeps' indicates the answer is hidden within the clue.
'HALF' is hidden in the letters of 'lethal force'.
(Other definitions for half that I've seen before include "one over a couple" , "proportion" , "One of two equal parts" , "shared round" , "Fifty per cent" .)