Legendary castle attended by fate (7)
I believe the answer is:
camelot
'legendary castle' is the definition.
(court of King Arthur)
'attended by fate' is the wordplay.
'attended' becomes 'came' (come can mean to attend).
'by' says to put letters next to each other.
'fate' becomes 'lot' (synonyms).
'came'+'lot'='CAMELOT'
(Other definitions for camelot that I've seen before include "Legendary court" , "royal court" , "romantic place" , "Idyllic place" , "the Kennedy era" .)