Commotion starts in showers, then inmates riot (4)

I believe the answer is:

stir

'commotion' is the definition.
('stir' can be a synonym of 'commotion')

'starts in showers then inmates riot' is the wordplay.
'starts in' suggests taking the first letters.
The first letters of 'showers then inmates riot' is 'STIR'.

(Other definitions for stir that I've seen before include "unrest" , "Mix the ingredients" , "Arouse (a memory)" , "College" , "beat" .)

I've seen this clue in The Times.

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