Two red berries for William Joyce? (3-3)

I believe the answer is:

haw-haw

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'william joyce?' is the definition.
The definition suggests a singular noun which matches the answer.

'two red berries' is the wordplay.
'two' shows that letters should be duplicated.
'red berries' becomes 'haw' (I am not sure about this - if you are sure you should believe this answer much more).
'haw' doubled is 'HAW-HAW'.

'for' is the link.

Can you help me to learn more?

(Another definition for haw-haw that I've seen is " Sound of a loud laugh".)

I've seen this clue in The Independent.

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