China screened revolutionary weapon (7)
I believe the answer is:
machete
'weapon' is the definition.
(machete is a kind of weapon)
'china screened revolutionary' is the wordplay.
I cannot really see how this works, but
'china' could be 'ch' and 'ch' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for machete that I've seen before include "Broad heavy knife common in Central America" , "A heavy-duty jungle knife" , "Large heavy knife for cutting vegetation" , "hacker" , "Heavy South American knife" .)