"Unforgettable" singer (4)
I believe the answer is:
cole
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unforgettable singer</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 cole that I've seen before include "Old nursery rhyme king" , "Elderly monarch" , "died in 2015" , "Old English king!" , "Cabbage" .)