Most recent appointment gets the call (4,4)
I believe the answer is:
last post
'the call' is the definition.
(thesaurus)
'most recent appointment' is the wordplay.
'most recent' becomes 'last' (I've seen this before).
'appointment' becomes 'post' (I've seen this before).
'last'+'post'='LAST POST'
'gets' acts as a link.
(Other definitions for last post that I've seen before include "Call for those retiring" , "notes we hear on Armistice Day" , "Bedtime bugle call" , "Evening collection" , "final delivery" .)