Crossword Genius

Sunken boundary (2-2)

Ross

I believe the answer is:

ha-ha

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sunken boundary</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ha-ha that I've seen before include "Representation of laughter" , "Loud laugh" , "that I find amusing" , "Feature of posh garden" , "Hidden ditch" .)

I've seen this clue in The Times.
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