___ bono (3)

I think it could be either:

pro

cui

(Other definitions for pro that I've seen before include "In favour of; advantage" , "Of argument, say, in favour of" , "Expert (abbr)" , "Prefix meaning for" , "In brief, he's no amateur" .)

I've seen this clue in The Washington Post Sunday, the Universal, the Thinks.com and The Washington Post.

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