Insisting that you tell all again (9,1,7)

I believe the answer is:

demanding a recount

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'insisting that you' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'tell all again' is the wordplay.
I cannot really understand how this works, but
'tell' could be 'recount' (synonyms) and 'recount' is found within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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