Butcher left these with a set of choppers (5,5)
I believe the answer is:
false teeth
'set of choppers' is the definition.
(choppers can informally mean teeth)
'butcher left these with a' is the wordplay.
'butcher' indicates an anagram.
'with' means one lot of letters goes inside another.
'left'+'these'='leftthese'
'leftthese' with letters rearranged gives 'flseteeth'.
'flseteeth' going around 'a' is 'FALSE TEETH'.
(Other definitions for false teeth that I've seen before include "set out at night" , "Choppers that may be taken out" , "New gnashers!" , "Denture's components" , "Plates" .)