Escarpment (5)
I believe the answer is:
ridge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">escarpment</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 ridge that I've seen before include "Wrinkle" , "Raised crease" , "Part of mountain" , "A narrow raised strip in bridges" , "Raised strip between two furrows" .)