Send Pole to announce appointment (4)
I believe the answer is:
post
I believe this clue is a quadruple definition!!
'send' is the first definition.
(to send in the post)
'pole' is the second definition.
(post can mean a pole or stake)
'to announce' is the third definition.
(I know that post is a type of announce)
'appointment' is the fourth definition.
(I've seen this in another clue)
(Other definitions for post that I've seen before include "Member < to comment on website" , "Part of address" , "delivery" , "Pole - position" , "Prefix meaning after" .)