Force, compel (6)
I believe the answer is:
coerce
This clue is a double definition.
'force' is the first definition.
(synonyms)
'compel' is the second definition.
(coercing is a kind of compelling)
(Other definitions for coerce that I've seen before include "Persuade using threats" , "Railroad" , "Force into obedience" , "Forcibly compel" , "Make or compel" .)