Crossword Genius

Streetwise rodent died (6)

Ross

I believe the answer is:

shrewd

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'died' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally define each other.

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

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(Other definitions for shrewd that I've seen before include "Astute, clever" , "Canny and calculating" , "Wily" , "Craftily astute" , "keen" .)

I've seen this clue in The Sun.
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