Comes into force? (7)
I believe the answer is:
enlists
'comes into' is the definition.
The definition and answer can be both to do with ownership as well as being verbs in their -s form.
Perhaps there's an association between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for enlists that I've seen before include "Signs up" , "Registers" , "volunteers" , "Recruits" , "Joins up" .)