It's rolled back for the opening (5)

I believe the answer is:

debut

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'the opening' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for debut that I've seen before include "The coming out of a society girl" , "First public appearance of performer" , "entrance" , "Appear in public for the first time" , "First attempt" .)

I've seen this clue in The Globe and Mail.

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