They are nominally unsuitable for inhabitants (9)

I believe the answer is:

outhouses

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This might be a double definition.

'they' is the first definition.
Both the answer and definition are plural nouns.
Perhaps you can see a link between them that I don't see?

'nominally unsuitable for inhabitants' is the second definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.

'are' acts as a link.

Can you help me to learn more?

(Another definition for outhouses that I've seen is " Sheds".)

I've seen this clue in The Globe and Mail.

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