Sharply inclined (5)
I believe the answer is:
steep
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sharply inclined</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 steep that I've seen before include "Hard for cycling" , "Rising sharply" , "Precipitous - outrageous" , "Soak thoroughly - precipitous" , "Quickly rising" .)