Come to a vigil (5)

I believe the answer is:

awake

'come to' is the definition.
(thesaurus)

'a vigil' is the wordplay.
'vigil' becomes 'wake' (wake is a kind of vigil).
'a'+'wake'='AWAKE'

(Other definitions for awake that I've seen before include "No longer in the land of Nod" , "Tossing and turning" , "Rouse; vigilant" , "Unable to sleep" , "Patriotic song 'The West's .....'" .)

I've seen this clue in The Telegraph.

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