Top record in the charts by foremost of tenors (7)

I believe the answer is:

singlet

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'top' is the definition.
(I know that singlet is a type of top)

I don't understand the rest of the clue.

(Other definitions for singlet that I've seen before include "Sleeveless garment" , "Tingles in vest" , "garment worn by men" , "Underwear" , "Something to wear" .)

I've seen this clue in The Independent.

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