Sean Craig MP mistreated election staff (11)

I believe the answer is:

campaigners

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'sean craig mp mistreated election staff' is the definition.
I can't tell whether this defines the answer.

'sean craig mp mistreated' is the wordplay.
'mistreated' indicates an anagram.
'sean'+'craig'+'mp'='seancraigmp'
'seancraigmp' anagrammed gives 'CAMPAIGNERS'.

Can you help me to learn more?

(Another definition for campaigners that I've seen is " Activists".)

I've seen this clue in the Sydney Morning Herald.

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