Broken arm holders stolen by David's weapon (9)
I believe the answer is:
slingshot
'weapon' is the definition.
(I've seen this before)
'broken arm holders stolen by' is the wordplay.
'broken arm holders' becomes 'slings' (I've seen this in another clue).
'stolen' becomes 'hot' (stolen goods are 'hot').
'by' means one lot of letters go next to another.
'slings'+'hot'='SLINGSHOT'
'david's' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for slingshot that I've seen before include "enough to knock you out" , "Weapon American kid may produce" , "fatal to Goliath" , "Catapult -- thin gloss (anag)" , "that can help you get a stone off" .)