Crossword Genius

Certain; optimistic (8)

Ross

I believe the answer is:

positive

I believe this is a double definition.

'certain' is the first definition.
(similar in meaning)

'optimistic' is the second definition.
(associated in meaning)

(Other definitions for positive that I've seen before include "'Definite, categorical (8)'" , "Sure, convinced" , "Optimistic; certain" , "Constructive, optimistic" , "Very sure, certain" .)

I've seen this clue in The Times.
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