Narrow canyon (6)
(Other definitions for ravine that I've seen before include "Steep-sided gorge" , "Deep narrow gorge with steep sides" , "Type of gorge" , "Canyon" , "'Deep, steep valley (6)'" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">narrow canyon</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 gorge that I've seen before include "Make a pig of oneself" , "Swallow greedily" , "Defile; stuff oneself" , "not fast" , "Overindulge" .)