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 the entire 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 Telegraph, the Newsday, the USA Today, the King Feature Syndicate, The Star Tribune, the LA Times, the Penny Press, the Universal, The Wall Street Journal and The New York Times.

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