4,840 square yards (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">4840 square yards</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 acre that I've seen before include "A state of W Brazil" , "Measure of land area" , "Persistent tendency" , "Race (anag.)" , "Imperial unit of area" .)