Cold chop to munch (4)
I believe the answer is:
chew
'munch' is the definition.
(I've seen this in another clue)
'cold chop' is the wordplay.
'cold' becomes 'c' (eg on taps).
'chop' becomes 'hew' (to hew is to chop or cut down).
'c'+'hew'='CHEW'
'to' is the link.
(Other definitions for chew that I've seen before include "What gossips do to fat" , "Reflect on" , "Try to eat" , "Ruminate" , "Bite repeatedly" .)