Mark hurt the Maori with a weapon (7)
I believe the answer is:
machete
'weapon' is the definition.
(machete is a kind of weapon)
'mark hurt the maori' is the wordplay.
'mark' becomes 'm'.
'hurt' becomes 'ache' (synonyms).
'the maori' becomes 'te' (I've seen this in other clues).
'm'+'ache'+'te'='MACHETE'
'with a' is the link.
(Other definitions for machete that I've seen before include "Teach me with large jungle knife" , "A heavy-duty jungle knife" , "Large heavy knife for cutting vegetation" , "Broad heavy knife used in S American jungles" , "Jungle chopper" .)