Three-toed sloths (3)

I believe the answer is:
ais
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">three-toed sloths</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ai' can be a synonym of 'three-toed sloth')</span><br/ ><br/ >This is all the clue.<br/ ></span>
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