Crossword Genius

Actors given holiday seasons with new introduction (7)

Ross

I believe the answer is:

mummers

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'actors' is the definition.
(I know this)

I don't understand the remainder of the clue.

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(Other definitions for mummers that I've seen before include "acting troupe" , "Masked actors in folk plays" .)

I've seen this clue in The Telegraph.
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