Rate at which colds get better? (5)

I believe the answer is:

scold

I'm a little stuck... Click here to teach me more about this clue!

'rate' is the definition.
(I've seen this before)

'which colds get better?' is the wordplay.
'colds' can be anagrammed to 'SCOLD'.
Though, I am not clear how the anagram is indicated.

'at' is the link.

Can you help me to learn more?

(Other definitions for scold that I've seen before include "Complaining woman" , "Rate" , "Chide, rebuke" , "Chide - nag" , "Upbraid" .)

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

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