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 am 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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