Crossword Genius

Nice parting speech? (5)

Ross

I believe the answer is:

adieu

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This clue might be a double definition.

'nice parting' is the first definition.
(I've seen this in another clue)

'speech?' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for adieu that I've seen before include "Auf wiedersehen" , "Farewel" , "Goodbye, madame" , "Farewell, Monsieur!" , "See you later" .)

I've seen this clue in The Telegraph.
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