Cheat me out of a knife (7)
I believe the answer is:
machete
'knife' is the definition.
(machete is a kind of knife)
'cheat me out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'cheat'+'me'='cheatme'
'cheatme' with letters rearranged gives 'MACHETE'.
'of a' acts as a link.
(Other definitions for machete that I've seen before include "Broad heavy knife used in S America" , "Cheat me over broad heavy knife used in jungle" , "Heavy knife used as weapon" , "A heavy-duty jungle knife" , "Broad heavy knife used in S American jungles" .)