Immaterial (10)
I believe the answer is:
irrelevant
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">immaterial</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for irrelevant that I've seen before include "neither here nor there" , "Beside the point" , "without connection" , "Not material" , "off-piste?" .)