U2 frontman (4)
I believe the answer is:
bono
'u2 frontman' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bono that I've seen before include "U2's main singer and lyricist" , "Pro . . . . publico - for the common good" , "Famous singer in famous band" , "U2 frontman" , "Singer in a leading band" .)