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

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