One agitating in prison? About right (7)

I believe the answer is:

stirrer

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'one agitating' is the definition.
(someone who causes agitation)

'in prison? about right' is the wordplay.
'in prison?' becomes 'stir' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' becomes 're' (regarding).
'right' becomes 'r' (abbreviation).
'stir'+'re'+'r'='STIRRER'

Can you help me to learn more?

(Other definitions for stirrer that I've seen before include "One deliberately causing trouble" , "Troublesome" , "Implement for mixing" , "Spoon - agitator" , "One making solution perhaps" .)

I've seen this clue in The Times.

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