Area of high level ground (7)
I believe the answer is:
plateau
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">area of high level ground</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 plateau that I've seen before include "State of little change after a period of activity" , "Large level tract of elevated land" , "Flat raised land" , "relatively flat territory" , "Paul, eat! (anag)" .)