Informed by a dolt? (4)

I believe the answer is:

told

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'informed' is the definition.
(telling is a kind of informing)

'a dolt?' is the wordplay.
'dolt' can be anagrammed to 'TOLD'.
However, I'm unsure how the anagram is indicated.

'by' is the link.

Can you help me to learn more?

(Other definitions for told that I've seen before include "Related (a story)" , "Informed; narrated" , "Produced effect; related" , "Said" , "Made an impact" .)

I've seen this clue in the Evening Standard.

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