Jab once, as producing King James' supporters (9)

I believe the answer is:

jacobeans

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'king james' supporters' is the definition.
I can't tell whether this definition defines the answer.

'jab once as producing' is the wordplay.
'producing' indicates anagramming the letters.
'jab'+'once'+'as'='jabonceas'
'jabonceas' anagrammed gives 'JACOBEANS'.

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

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