Sloping, tilting (8)
I believe the answer is:
slanting
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">sloping</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that sloping can be written as slanting)</span><br/ ><br/ >'<span class="explanation-format__original">tilting</span>' is the second definition.<br/ ><span class="explanation-format__explanation">('slant' can be a synonym of 'tilt')</span><br/ ><br/ ></span>
(Other definitions for slanting that I've seen before include "Leaning, sloping" , "Sloping, tilting" , "not on the level" .)