Does its roof have a slate loose? (8)

I believe the answer is:

madhouse

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'slate loose?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for madhouse that I've seen before include "asylum" , "state of chaos" , "pandemonium?" , "9d 21d [BEDLAM]" , "badly run establishment?" .)

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