Crossword Genius

Tear off to collect ten more (5)

Ross

I believe the answer is:

extra

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'more' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Minor actor in crowd scene" , "person in shot?" , "Taxer (anag.)" , "Maybe wide" , "Not a hit certainly" .)

I've seen this clue in The Times and The Telegraph.
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