Frontier judge Bean (3)
I believe the answer is:
roy
'frontier judge bean' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for roy that I've seen before include "'... Rogers, old film star cowboy (3)'" , "Rob . . . was a notorious Scottish outlaw" , "'Rob ..., ... Rogers (3)'" , "-- Lichtenstein, US artist" , "Rob . . . was a famous Scottish outlaw" .)