Clever Chinese dog, not English one (5)

I believe the answer is:

sharp

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'clever' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for sharp that I've seen before include "Acidic; smart and stylish" , "Not blunt" , "needing strings slackened?" , "Keen - exactly" , "character on the staff" .)

I've seen this clue in The Times.

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