Laughter from the boundary? (2-2)
I believe the answer is:
ha-ha
'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" .)