The rest of the day? (6)
I believe the answer is:
siesta
'the rest of the day' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for siesta that I've seen before include "Afternoon snooze" , "Afternoon relaxation" , "PM snoozing?" , "A Spanish mid-day nap" , "Afternoon nap in Cadiz" .)