Look for Cockney choppers (8)
I believe the answer is:
butchers
'look' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for butchers that I've seen before include "Retailers of meat" , "Meat workers" , "Cutters and sellers of meat" , "Abbreviated rhyming slang for 'look'" , "Animal killers in Schubert composition" .)