Notedly good-hearted humorist (5)

I believe the answer is:

joker

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

'notedly good-hearted' is the wordplay.
'notedly' becomes 'joke' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'good' becomes 'err' (I've seen this in another clue).
'hearted' means to look at the middle letters.
The centre of 'err' is 'r'.
'joke'+'r'='JOKER'

Can you help me to learn more?

(Other definitions for joker that I've seen before include "Prankster" , "Card - wag" , "Comedian" , "Humorist" , "Wild card" .)

I've seen this clue in the Evening Standard.

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