Bend a weapon (3)
I believe the answer is:
bow
This clue is a double definition.
'bend' is the first definition.
(I know that bend can be written as bow)
'a weapon' is the second definition.
(bow is a kind of weapon)
(Other definitions for bow that I've seen before include "Bend in reverence or submission" , "Stoop" , "Weapon for shooting arrows" , "at front of vessel" , "Front of boat" .)