An upward slope or grade (6)
I believe the answer is:
ascent
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">an upward slope</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">grade</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for ascent that I've seen before include "Maybe promotion" , "Stance (anag)" , "way up the mountain" , "Upward climb" , "progress" .)