To have two halves is sort of funny (2-2)

I believe the answer is:

ha-ha

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'funny' is the definition.

I don't understand the remainder of the clue.

(Other definitions for ha-ha that I've seen before include "Sunk fence" , "Ditch with wall in it - sounds hilarious" , "Fenced or walled boundary ditch" , "Laugh - ditch acting as fence" , "Low ditch with wall in it" .)

I've seen this clue in the Sydney Morning Herald.

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