The appointment after (4)
I believe the answer is:
post
This clue is a double definition.
'the appointment' is the first definition.
(I've seen this before)
'after' is the second definition.
(I've seen this before)
(Other definitions for post that I've seen before include "Station" , "Leave message online" , "Upright length of wood or metal a permanent military establishment" , "Maybe letters" , "type of support" .)