Parliament organised a sit-in -- these people may demand regime change (10)

I believe the answer is:

dietitians

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'these people may demand regime change' is the definition.
The definition suggests an adverb but the answer is not.

'parliament organised a sit-in' is the wordplay.
'parliament' becomes 'diet' (I've seen this before).
'organised' indicates an anagram.
'a'+'sit'+'in'='asitin'
'asitin' is an anagram of 'itians'.
'diet'+'itians'='DIETITIANS'

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I've seen this clue in The Telegraph.

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