Broad heavy knife (7)
I believe the answer is:
machete
'broad heavy knife' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for machete that I've seen before include "Knife for hacking" , "Jungle blade" , "cutter" , "Broad heavy knife used in S American jungles" , "Cheat me over broad heavy knife used in jungle" .)