Nice farewell? (2,6)

I think it could be either:

Which length description are you looking for?:

2,6

au revoir

'nice farewell?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for au revoir that I've seen before include "'Goodbye to the French (2,6)'" , "So long, see you soon - in France" , "Final words" , "So long, 'bye for now - in France" , "cheers" .)

I've seen this clue in The Sun.

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