Oscar escapes mounting disturbances and commotion (4)

I believe the answer is:

stir

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'commotion' is the definition.
(I know that stir is a type of commotion)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stir that I've seen before include "where porridge is served" , "Move around - prison" , "Mix the ingredients" , "can > go forth" , "Move around in a liquid" .)

I've seen this clue in The Telegraph.

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