A French comic entertainer? (4)

I believe the answer is:

dawn

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'a french' is the definition.
(comedian Dawn French)

I can't explain the rest of the clue.

(Other definitions for dawn that I've seen before include "Early morning sing-song?" , "Threshold" , "Daybreak" , "Sunrise" , "Aurora was its goddess" .)

I've seen this clue in The Times.

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