Measure of land area (4)
I believe the answer is:
acre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">measure of land area</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 "Square measure of land" , "A state of W Brazil" , "marine location in Israel" , "Imperial unit of area" , "Four thousand, eight hundred and forty square yards" .)