Crossword Genius

21 Across is drunk -- socially acceptable -- cheers! (5)

Ross

I believe the answer is:

adieu

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'cheers' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for adieu that I've seen before include "Ciao, in French" , "Vale" , "the last word in France" , "Farewell, adios" , "the last word in Paris" .)

I've seen this clue in The Telegraph.
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