Crossword Genius

Rose may have got up as one (7)

Ross

I believe the answer is:

synonym

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This clue could be a double definition.

'rose may have' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'up as one' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'got' acts as a link.

Can you help me to learn more?

(Other definitions for synonym that I've seen before include "Equivalent word" , "Substitute brought in for a term" , "Alternative word" , "A word that is interchangeable with another" , "Quick crossword clue" .)

I've seen this clue in The Times and The Sun.
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