Sheriff's men (5)
I believe the answer is:
posse
'sheriff's men' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for posse that I've seen before include "Group of friends together" , "Troop at the service of a local sheriff" , "Sheriff's party" , "Band of lawmen" , "Band of people involved in some activity" .)