Wide area (7)
I believe the answer is:
expanse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wide 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 expanse that I've seen before include "Range - spread" , "reach" , "Swathe" , "considerable area" , "Wide continuous area" .)