Chop up (5)
I believe the answer is:
mince
'chop up' is the definition.
(mincing is a kind of chopping up)
This is all the clue.
(Other definitions for mince that I've seen before include "meat that's prepared" , "Chop into tiny pieces" , "Ground meat - walk affectedly" , "Shredded beef" , "Cut meat into small pieces, or walk affectedly" .)