Watchful attention (5)
I believe the answer is:
vigil
'watchful attention' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vigil that I've seen before include "Through the night, one kept" , "Period of staying awake to watch or pray" , "Night-time watch" , "The rite of staying awake for devotional purposes" , "Rite of staying awake for prayer on the eve of a religious festival" .)