The case for having an advisory council (7)

I believe the answer is:

cabinet

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'advisory council' is the definition.
(thesaurus)

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

(Other definitions for cabinet that I've seen before include "Senior government ministers" , "Ministerial committee" , "Furniture item or collective government ministers" , "Collective noun for senior ministers" , "meeting at Number Ten" .)

I've seen this clue in the Evening Standard.

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