Crossword Genius

Be an agitator in prison (4)

Ross

I believe the answer is:

stir

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'prison' is the definition.
(informal term for prison)

'be an agitator in' is the wordplay.
'be an' becomes 'i' (Roman numeral for one).
'agitator' becomes 'str' (I am not sure about this - if you are sure you should believe this answer much more).
'in' means one lot of letters goes inside another.
'i' placed inside 'str' is 'STIR'.

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(Other definitions for stir that I've seen before include "Prison (sl.); agitate" , "in which you'll find people with convictions" , "Create revolutionary movement" , "Mix the ingredients" , "jail" .)

I've seen this clue in the Evening Standard.
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