I whipped one pate into snack (4,3)
I believe the answer is:
meat pie
'snack' is the definition.
(I've seen this before)
'i whipped one pate' is the wordplay.
'i' becomes 'me'.
'whipped' is an anagram indicator.
'one' becomes 'I' (Roman numeral).
'i'+'pate'='ipate'
'ipate' with letters rearranged gives 'atpie'.
'me'+'atpie'='MEAT-PIE'
'into' acts as a link.
(Other definitions for meat pie that I've seen before include "Ape time (anag.)" , "Snack" , "fare" , "Pastry covered dish containing pork, beef etc" .)