Bend for archer's weapon (3)
I believe the answer is:
bow
This clue is a double definition.
'bend' is the first definition.
(I know that bend is a kind of bend)
'archer's weapon' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for bow that I've seen before include "District in East London" , "Arc" , "Make reverence" , "Front part of a ship" , "Piece of weaponry" .)