Small natural hill (5)
I believe the answer is:
knoll
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small natural hill</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for knoll that I've seen before include "Small rounded hill" , "Small natural hill, perhaps grassy" , "Round hillock" , "Hummock" , "Small round hill" .)