Came to a vigil in the graveyard at last (8)
I believe the answer is:
awakened
'came to' is the definition.
(to come to is to wake up)
'a vigil in the graveyard at last' is the wordplay.
'vigil' becomes 'wake' (wake is a kind of vigil).
'at last' indicates one should take the final letters.
The final letters of 'in the graveyard' are 'ned'.
'a'+'wake'+'ned'='AWAKENED'
(Other definitions for awakened that I've seen before include "stirred" , "Woke up" , "had stirring effect" , "Aroused from sleep" , "Became conscious" .)