Lead singer of U2 (4)
I believe the answer is:
bono
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lead singer of u2</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 bono that I've seen before include "Famous singer in famous band" , "U2's star vocalist" , "U2's main singer and lyricist" , "Singer in a leading band" , "Pro . . . . publico - for the common good" .)