Eldest son of a French king (7)

I believe the answer is:

dauphin

'eldest son of a french king' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for dauphin that I've seen before include "King of France's heir" , "former royal" , "Heir apparent to the French throne" , "Formerly, the eldest son of the King of France" , "French royal heir" .)

I've seen this clue in The Telegraph.

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