Twisting origin - vital for supervisor (11)

I believe the answer is:

invigilator

'for supervisor' is the definition.
(invigilator is a kind of supervisor)

'twisting origin vital' is the wordplay.
'twisting' is an anagram indicator.
'origin'+'vital'='originvital'
'originvital' anagrammed gives 'INVIGILATOR'.

(Another definition for invigilator that I've seen is " Supervisor".)

I've seen this clue in The Daily Express.

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