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

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