French farewell (5)

I think it could be either:

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1,7 5*

'french farewell' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for adieu that I've seen before include "12 Down" , "Some say it when leaving" , "Parting word" , "Farewell, Monsieur!" , "Leave" .)

I've seen this clue in the Newsday, The Telegraph, the Penny Press, The Star Tribune, the Universal, The Wall Street Journal, the USA Today, the LA Times, the King Feature Syndicate and The New York Times.

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