Sonora snooze (6)
I believe the answer is:
siesta
'sonora snooze' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for siesta that I've seen before include "A Spanish mid-day nap" , "Spanish afternoon activity" , "Forty winks" , "An afternoon nap in Spain" , "Rest in the heat of the day" .)