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

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