Communist China secures weapon (7)
I believe the answer is:
machete
'weapon' is the definition.
(machete is a kind of weapon)
'communist china secures' is the wordplay.
'communist' becomes 'che' (I can't explain this - if you can you should give a lot more credence to this answer).
'china' becomes 'mate' (china plate is Cockney rhyming slang for mate).
'secures' is an insertion indicator.
'che' placed within 'mate' is 'MACHETE'.
Can you help me to learn more?
(Other definitions for machete that I've seen before include "Knife for hacking" , "Jungle blade" , "Jungle chopper" , "Heavy South American knife" , "hacker" .)