Very steep cliff (9)
I believe the answer is:
precipice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very steep cliff</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 precipice that I've seen before include "(Overhang of) steep cliff" , "Steep drop" , "Steep cliff face" , "Sheer cliff" , "Sheer drop" .)