A niche for a holiday? (6)
I believe the answer is:
recess
I believe this is a double definition.
'a niche' is the first definition.
('recess' can be a synonym of 'niche')
'a holiday?' is the second definition.
(both can mean a break)
'for' is the link.
(Other definitions for recess that I've seen before include "(Political) holiday" , "'Niche, inlet (6)'" , "Temporary cessation from business" , "Parliamentary downtime" , "School break - niche" .)