Crucifix with bend in arm (8)
I believe the answer is:
crossbow
'arm' is the definition.
(crossbow is a kind of arm)
'crucifix with bend' is the wordplay.
'crucifix' becomes 'cross' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'bend' becomes 'bow' (bowing is a kind of bending).
'cross'+'bow'='CROSSBOW'
'in' acts as a link.
(Other definitions for crossbow that I've seen before include "William Tell's weapon" , "Old weapon with mechanism for firing arrow" , "Medieval weapon" , "Weapon (used to set off a quarrel?)" , "Missile-launcher" .)