Merseyside town — White Christmas singer (6)

I believe the answer is:

crosby

(Other definitions for crosby that I've seen before include "Merseyside town - White Christmas singer, d. 1977" , "Bing . . . . . ., king of the crooners" , "Bing ......, great crooner" , "Bing -, US crooner" , "He sang "White Christmas" in the film Holiday Inn" .)

I've seen this clue in The Guardian.

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