Crossword Genius

Early French joke? (5,2,4)

Ross

I believe the answer is:

crack of dawn

I'm a little stuck... Click here to teach me more about this clue!

'early french joke?' is the definition.
The definition suggests a singular noun which matches the answer.

'french joke?' is the wordplay.
I cannot quite understand how this works, but
'french' could be 'dawn' (comedian Dawn French) and 'dawn' is found within the answer.
'joke?' could be 'crack' (a crack is a joke or quip) and 'crack' is found within the answer.
The remaining letters 'of' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for crack of dawn that I've seen is " First light".)

I've seen this clue in the Sydney Morning Herald.
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