Exclamation of surprise has produced laughter (2-3)

I believe the answer is:

ha-has

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'laughter' is the definition.
(I've seen this in another clue)

'exclamation of surprise has' is the wordplay.
I cannot really see how this works, but
'exclamation' could be 'hah' (I've seen this in another clue) and 'hah' is found in the answer.
The remaining letters 'as' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'produced' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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