Weapons and gifts exchanging hands (4)
I believe the answer is:
arms
'weapons' is the definition.
('arm' can be a synonym of 'weapon')
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for arms that I've seen before include "Members" , "Arsenal's items?" , "George Bernard Shaw play '. . . . and the Man'" , "Supplies weapons" , "Weapons and limbs" .)