Reportedly Kentish beauty queen's blunder at table (7)

I believe the answer is:

misdeal

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'blunder at table' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for misdeal that I've seen before include "Right hand that isn't" , "Give out the cards wrongly" , "Faulty distribution" , "Faulty issue of cards" , "Wrongly issue" .)

I've seen this clue in The Times.

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