Stays in confinement (6)
I believe the answer is:
corset
This could be a double definition.
'stays' is the first definition.
('corset' can be a synonym of 'stays')
'confinement' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for corset that I've seen before include "Tight-fitting ladies' garment" , "A woman's close-fitting support undergarment" , "female garment!" , "Close-fitting foundation garment" , "Sector (anag)" .)