Bustle in which guest of Her Majesty is found (4)

I believe the answer is:

stir

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'bustle' is the definition.
(synonyms)

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

(Other definitions for stir that I've seen before include "prompt" , "where porridge is served" , "Stimulate; prison" , "Agitate; wake from sleep" , "Arouse (a memory)" .)

I've seen this clue in The Telegraph.

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