Furthest away (7)
I believe the answer is:
endmost
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">furthest away</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 endmost that I've seen before include "Farthest" , "Most distant" , "Last in a row" , "extreme situation" , "Furthest away" .)