Ol' Blue Eyes, e.g. (7)

I believe the answer is:

crooner

(Other definitions for crooner that I've seen before include "Sentimental balladeer" , "Singer of quiet songs" , "Crosby or Sinatra?" , "Profession of Bing, Frank or Perry" , "Crosby-type singer" .)

I've seen this clue in The New York Times.

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