Crossword Genius

Lesser-played half of a 45

Ross

I think it could be either:

Which length description are you looking for?:

1,4

5*

b side

(Other definitions for b side that I've seen before include "Pop single's second song" , "Single's less good song" , "Less important number of a pop single" , "most singles had one" .)

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