Holiday depression (6)
I believe the answer is:
recess
I believe this is a double definition.
'holiday' is the first definition.
(both can mean a break)
'depression' is the second definition.
(I've seen this before)
(Other definitions for recess that I've seen before include "Temporary suspension of a session" , "School break - niche" , "Small niche or court holiday" , "Holiday period" , "Niche, hollow in a wall" .)