Butcher’s cleared up, packing last of pork (5)
I believe the answer is:
dekko
'butcher's' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'cleared up packing last of pork' is the wordplay.
'cleared' becomes 'oked' (oking is a kind of clearing).
'up' is a reversal indicator (in down clue: letters go upwards).
'packing' means one lot of letters goes inside another.
'last of' says to take the final letters.
The last letter of 'pork' is 'k'.
'oked' in reverse letter order is 'deko'.
'deko' placed around 'k' is 'DEKKO'.
(Other definitions for dekko that I've seen before include "Butcher's" , "Quick look or glance" , "Look-see" , "Quick glance (informal)" , "Shufti" .)