Sobriquet of Harry Lillis Crosby Jr. (4)

I believe the answer is:

bing

(Other definitions for bing that I've seen before include "The Old Groaner" , "Sobriquet of Harry Lillis Crosby" , "-- Crosby, singer" , "Daddy of the crooners . . . . Crosby" .)

I've seen this clue in The Guardian.

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