High ground (5)
(Other definitions for hills that I've seen before include "See 7" , "Mounts" , "Heights; tors" , "Elevations of land" , "High terrain" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">high ground</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 hill that I've seen before include "Incline" , "Fell" , "High mass of land" , "High point, but not a mountain" , "Small mountain" .)