Minor performers put on the bill? (6)

I believe the answer is:

extras

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'minor performers' is the definition.
(extras are minor actors)

I cannot understand how the rest of the clue works.

(Other definitions for extras that I've seen before include "Sundries" , "Spear carriers" , "Additions" , "Minor actors in crowd scenes" , "Wides, byes, etc." .)

I've seen this clue in The Irish Independent.

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