First of all, actress narks discomfited ITV presenter Peters? (4)

I believe the answer is:

andi

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'presenter peters?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'first of all actress narks discomfited itv' is the wordplay.
'first of all' suggests taking the first letters.
The first letters of 'actress narks discomfited itv' is 'ANDI'.

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