Alphabetical list of rooms with legal occupants? (8)

I believe the answer is:

chambers

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'rooms with legal occupants?' is the definition.
'chambers' can be an answer for 'rooms' (thesaurus). I am unsure of the 'with legal occupants?' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for chambers that I've seen before include "Set of rooms as for judge" , "Judge's room - dictionary" , "barristers' rooms" , "vaults" , "Rooms for the judge and dictionary" .)

I've seen this clue in The Independent.

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