Crook Abel's killer mentioned (4)
I believe the answer is:
cane
'crook' is the definition.
(I've seen this in another clue)
'killer mentioned' is the wordplay.
'killer' becomes 'cain' (Cain who killed Abel).
'mentioned' indicates a 'sounds like' (homophone) clue.
'cain' is a homophone of 'CANE'.
'abel's' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cane that I've seen before include "Birch" , "Flog" , "Malacca, perhaps" , "Type of sugar; beat" , "Rod for beating" .)