Chop piece of ham in cellar (5)
I believe the answer is:
mince
'chop' is the definition.
(mincing is a kind of chopping)
'piece of ham in cellar' is the wordplay.
'piece of' indicates the answer is hidden within the clue.
'MINCE' is hidden within 'ham in cellar'.
(Other definitions for mince that I've seen before include "Dice" , "Cut fine" , "Simper" , "Walk affectedly to get chopped meat" , "getting chop" .)