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Carefree Oscar called out "goodbye" (7)

Ross

I believe the answer is:

cheerio

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'goodbye' is the definition.
(synonyms)

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(Other definitions for cheerio that I've seen before include "Farewell - drinking toast" , "Expression used when leaving" , "Say this before drinking" , "Ta-ta" , "A final word" .)

I've seen this clue in The Irish Times.
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