Heavy knife (7)
'heavy knife' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for machete that I've seen before include "cutter" , "Jungle blade" , "Knife for hacking" , "The mace (anag.)" , "Heavy South American knife" .)
(Other definitions for cleaver that I've seen before include "dangerous object?" , "Long-bladed hatchet" , "A butcher's chopping tool" , "A butcher may use it" , "Hatchet for chopping meat" .)