Crossword Genius

Positive agreement (4)

Ross

I believe the answer is:

sure

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

I don't understand how the remainder of the clue works.

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(Other definitions for sure that I've seen before include "Certain to be a ruse" , "The old sewer" , "Completely certain" , "certainly in the USA" , "Safe" .)

I've seen this clue in the Evening Standard.
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