Crossword Genius

Optimistic, informally (6)

Ross

I believe the answer is:

upbeat

(Other definitions for upbeat that I've seen before include "Heartening" , "Of mood, cheerful and optimistic" , "Cheerful and positive, as in music" , "Cheerfully optimistic" , "Cheerful and encouraging, like lively music" .)

I've seen this clue in the Evening Standard.
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