Kept appointment with fate coming to Arthur's Seat (7)
I believe the answer is:
camelot
'arthur's seat' is the definition.
(court of King Arthur)
'kept appointment with fate' is the wordplay.
'kept appointment' becomes 'came' (attended or went to an appointment).
'with' is a charade indicator (letters next to each other).
'fate' becomes 'lot' (synonyms).
'came'+'lot'='CAMELOT'
'coming to' is the link.
(Other definitions for camelot that I've seen before include "Legendary Arthurian kingdom" , "Lerner and Loewe musical" , "Location of King Arthur's court" , "Mythical British kingdom" , "romantic place" .)