Good-hearted bit of fun (4)

I believe the answer is:

joke

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This could be a double definition.

'good-hearted bit' is the first definition.
'joke' can be an answer for 'bit' (I have seen 'bit of humour' mean 'joke' so perhaps 'bit' could also mean 'joke'). I am not certain of the 'good-hearted' bit.

'fun' is the second definition.
(thesaurus)

'of' acts as a link.

Can you help me to learn more?

(Other definitions for joke that I've seen before include "Quip, witticism" , "Witticism, jest" , "Gag" , "bit of humour" , "Wisecrack" .)

I've seen this clue in the Evening Standard.

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