"Ice cream or cake?" response, perhaps (4)
I believe the answer is:
both
'ice cream or cake? response perhaps' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for both that I've seen before include "Each of two (alternatives)" , "The two (things)" , "Two considered together" , "The one and the other" , "couple" .)