Lawyer's pro __ work (4)

I believe the answer is:

bono

(Other definitions for bono that I've seen before include "U2 frontman" , "Pro . . . . publico - for the common good" , "Lead singer of U2" , "U2's main singer and lyricist" , "Singer in a leading band" .)

I've seen this clue in the Newsday.

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