Not essential (10)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not essential</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for extraneous that I've seen before include "Foreign" , "Irrelevant; of outside origin" , "Of external origin" , "Unrelated, irrelevant" , "Not belonging" .)
(Other definitions for expendable that I've seen before include "Easily abandoned" , "Easily sacrificed" , "not important" , "Able to be sacrificed" .)
(Other definitions for dispensable that I've seen before include "Non-essential" , "Able to be done without" , "That can be got rid of" .)