Break niche (6)
I believe the answer is:
recess
I believe this clue is a double definition.
'break' is the first definition.
(I know that break can be written as recess)
'niche' is the second definition.
(I know that niche can be written as recess)
(Other definitions for recess that I've seen before include "bay" , "break needed!" , "Breaktime" , "Niche, alcove" , "'Niche, inlet (6)'" .)