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It's noted for its slowness (5)

Ross

I believe the answer is:

largo

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'slowness' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I don't understand the rest of the clue.

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(Other definitions for largo that I've seen before include "Florida key: musical slow movement" , "Musically in slow tempo and dignified style" , "Slow and dignified tempo in music" , "Played with dignified slowness" , "Slow and dignified, like Handel's composition" .)

I've seen this clue in The Globe and Mail.
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