Not accustomed (6)
I believe the answer is:
unused
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not accustomed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for unused that I've seen before include "Not accustomed to" , "Not utilised" , "Neither employed nor second-hand" , "Unaccustomed" , "factory fresh" .)