Leg bound to be broken by heavy stick (8)
I believe the answer is:
bludgeon
'heavy stick' is the definition.
(I've seen this before)
'leg bound to be broken' is the wordplay.
'to be broken' indicates an anagram.
'leg'+'bound'='legbound'
'legbound' is an anagram of 'BLUDGEON'.
'by' is the link.
(Other definitions for bludgeon that I've seen before include "Short stick with thickened end as weapon" , "Thick club" , "Thick stick with a heavy end" , "Strike with a club" , "Beat repeatedly with a heavy object" .)