Fine; steep (5)
I believe the answer is:
sheer
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">fine</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">steep</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for sheer that I've seen before include "Outright" , "Precipitous or fine" , "Very fine or vertical" , "Utter - precipitous" , "Simple" .)