Crossword Genius

Wide, say and so long (3)

Ross

I believe the answer is:

bye

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'so long' is the definition.
(synonyms)

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(Other definitions for bye that I've seen before include "See you" , "Stay out of round" , "So long" , "[ADIEU]" , "(Informal) valediction" .)

I've seen this clue in The Times.
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