Prepare to swallow cold chop (4)
I believe the answer is:
chew
'prepare to swallow' 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'
(Other definitions for chew that I've seen before include "Bite and grind food in the mouth" , "Work or grind between teeth" , "Masticate, grind between teeth" , "champ" , "Prepare to swallow" .)