Country music's ___ + Shay (3)

I believe the answer is:

dan

(Other definitions for dan that I've seen before include "A Desperate cartoon character" , "Judo, karate level" , "Grade of proficiency in judo" , "Level of proficiency in Japanese combative sport" , "degree of proficiency in judo, say?" .)

I've seen this clue in The Wall Street Journal.

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