Positive ruse would work (4)

I believe the answer is:

sure

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'positive' is the definition.
(similar in meaning)

'ruse would work' is the wordplay.
'ruse' can be anagrammed to 'SURE'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sure that I've seen before include "Certain, confident" , "The old sewer" , "Feeling no doubt" , "See 12" , "Undoubtedly true" .)

I've seen this clue in The Mirror.

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