Crossword Genius

Laughter from the boundary? (2-2)

Ross

I believe the answer is:

ha-ha

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'laughter' is the definition.
(I know that ha-ha is a type of laughter)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for ha-ha that I've seen before include "Sunken boundary wall" , "Kind of ditch with wall in it" , "Ditch with a wall in it - that's a laugh" , "Ditch with wall in it - sounds merry" , "Laugh - ditch acting as fence" .)

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