Revolutionary picked up by comrade in chopper (7)
I believe the answer is:
machete
'chopper' is the definition.
(blade for chopping things down)
'revolutionary picked up by comrade' is the wordplay.
'revolutionary' becomes 'Che' (Che Guevara the Marxist revolutionary).
'picked up by' means one lot of letters goes inside another (some letters collected or picked up by others).
'comrade' becomes 'mate' (I've seen this in other clues).
'che' inserted inside 'mate' is 'MACHETE'.
'in' is the link.
(Other definitions for machete that I've seen before include "Broad heavy knife used in S American jungles" , "Heavy South American knife" , "Cheat me over broad heavy knife used in jungle" , "Teach me with large jungle knife" , "Large heavy knife for cutting vegetation" .)