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

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