Hog's back; saddle (5)
I believe the answer is:
ridge
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hog's back</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">saddle</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for ridge that I've seen before include "Line of higher ground" , "Narrow hill-range" , "German Baltic port, Buxtehude home" , "Peak" , "Long mountain crest or roof life" .)