Pit filled with cold meat (5)
I believe the answer is:
mince
'meat' is the definition.
(mince is a meat product)
'pit filled with cold' is the wordplay.
'pit' becomes 'mine' (mining pit).
'filled with' indicates putting letters inside.
'cold' becomes 'c' (eg on taps).
'mine' placed around 'c' is 'MINCE'.
(Other definitions for mince that I've seen before include "Finely chopped beef" , "Grind (food)" , "Finely cut meat" , "Chop into small pieces" , "Diced meat" .)