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Won't shed rot without covers? Precisely (2,3,3)

Ross

I believe the answer is:

on the dot

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'precisely' is the definition.
(on the dot can mean at a precise time)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for on the dot that I've seen before include "Promptly" , "Absolutely punctual" , "At precisely the right time" , "at exactly the arranged time" , "Sharp" .)

I've seen this clue in The Telegraph.
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