Treaty subject
I believe the answer is:
arms
'treaty subject' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arms that I've seen before include "See 12" , "International competition for weapons" , ". . . . and the Man (G B Shaw) (4)" , "Supplies weapons" , "George Bernard Shaw play '. . . . and the Man'" .)