Realtors' units (5)
I believe the answer is:
acres
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">realtors' units</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for acres that I've seen before include "large area of land" , "Land areas" , "One of them has 4840 square yards" , "lots" , "Land area measures" .)