Singers such as Ian Bostridge and Russell Watson (6)

I believe the answer is:

tenors

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'singers' is the definition.
(tenor is a singing voice)

I don't understand how the remainder of the clue works.

(Other definitions for tenors that I've seen before include "Male singers with high register" , "Opera singers" , "Male singers from Reston" , "Male singing voices" .)

I've seen this clue in The Times.

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