Amusing (and not peculiar) (5,2-2)

I believe the answer is:

funny ha-ha

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

'not peculiar' is the definition.
(I've seen this before)

'amusing' is the wordplay.
I cannot quite see how this works, but
'amusing' could be 'funny' (I've seen this before) and 'funny' is located in the answer.
The remaining letters 'haha' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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