Players at Belgrade Theatre's premier singer (8)

I believe the answer is:

redstart

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'players at' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'belgrade theatre's premier singer' is the wordplay.
'belgrade' becomes 'reds' (I can't justify this - if you can you should give a lot more credence to this answer).
'premier' indicates taking the first letters.
'singer' becomes 'art' (Art Garfunkel of Simon and Garfunkel).
The first letter of 'theatres' is 't'.
'reds'+'t'+'art'='REDSTART'

Can you help me to learn more?

(Other definitions for redstart that I've seen before include "Songbird" , "Bird of the thrush family" , "winger" , "Singer" , "Bird (coloured opening!)" .)

I've seen this clue in The Telegraph.

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