Prison clique causing trouble (8)

I believe the answer is:

stirring

'causing trouble' is the definition.
(I've seen this before)

'prison clique' is the wordplay.
'prison' becomes 'stir' (informal term for prison).
'clique' becomes 'ring' (I've seen this in another clue).
'stir'+'ring'='STIRRING'

(Other definitions for stirring that I've seen before include "Exciting" , "Rousing; mixing" , "Rousing (using a spoon?)" , "causing trouble" , "Moving" .)

I've seen this clue in The Guardian and The Sun.

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