Not acclaimed (6)
I believe the answer is:
unsung
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not acclaimed</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 unsung that I've seen before include "Without 1D [RECOGNITION]" , "Not properly acclaimed" , "Remarked by no-one" , "not recognised" , "Lacking due recognition" .)