Sword in poor repair (6)
I believe the answer is:
rapier
'sword' is the definition.
(rapier is a kind of sword)
'poor repair' is the wordplay.
'poor' indicates anagramming the letters.
'repair' anagrammed gives 'RAPIER'.
'in' acts as a link.
(Other definitions for rapier that I've seen before include "Sword for thrusting" , "A thin double-edged sword" , "A small spring flower" , "Thrusting weapon" , "Light sword" .)