Weapons linking shoulders and hands (4)
I believe the answer is:
arms
'weapons' is the definition.
('arm' can be a synonym of 'weapon')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for arms that I've seen before include "Blazonry; weaponry" , "They're used for picking up" , "Crest - guns" , "Weapons and limbs" , "Guns et cetera" .)