An appointment to eat? (4)
I believe the answer is:
date
'an appointment' is the definition.
(I know that appointment can be written as date)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for date that I've seen before include "Tryst" , "escort" , "Particular time of event - fruit" , "Day, month and year" , "Sweet fruit with a long woody seed" .)