The Collaborative International Dictionary of English v.0.48:
busker \busk"er\ n. a person who entertains people for money in public places (as by singing or dancing). [Chiefly British] [WordNet 1.5]WordNet (r) 3.0 (2006):
busker n 1: a person who entertains people for money in public places (as by singing or dancing), usually while asking for money