Diddly-squat, or zero, is round number in piquet (8)

I believe the answer is:

quatorze

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'round number in piquet' is the definition.
The definition suggests a singular noun which matches the answer.

'diddly-squat or zero' is the wordplay.
'QUATORZE' is hidden in amongst the letters.
But, I am unsure how this is indicated.

'is' is the link.

Can you help me to learn more?

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