Weapon that comes to hand (3)
I believe the answer is:
arm
This could be a double definition.
'weapon that' is the first definition.
'arm' can be an answer for 'weapon' (synonyms). I am not sure about the remainder of the definition.
'hand' is the second definition.
(thesaurus)
'comes to' acts as a link.
Can you help me to learn more?
(Other definitions for arm that I've seen before include "Limb or branch" , "Prime" , "strip of land?" , "Supply weapons" , "Equip with weapon" .)