Amount of land (7)
I believe the answer is:
acreage
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">amount of land</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for acreage that I've seen before include "Area measure" , "Land area" , "Farm" , "Measure used by farmer" , "expanse" .)