Ignoble (4)
I believe the answer is:
base
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ignoble</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 base that I've seen before include "Pedestal" , "Mean; HQ" , "Foundation; counterfeit" , "Ignoble; low part" , "Ignoble - HQ" .)