Compel men to go through broken fence (7)
I believe the answer is:
enforce
'compel' is the definition.
(enforcing is a kind of compelling)
'men to go through broken fence' is the wordplay.
'men' becomes 'or' (military abbreviation for Other Ranks).
'to go through' indicates putting letters inside.
'broken' indicates an anagram.
'fence' is an anagram of 'enfce'.
'or' going within 'enfce' is 'ENFORCE'.
(Other definitions for enforce that I've seen before include "Make (a law) obeyed" , "Impose compliance with (a law)" , "Insist on" , "Compel compliance or obedience" , "Administer with pressure (70" .)