Qualifications needed to ensure theatre seats? (12)

I believe the answer is:

reservations

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'qualifications' is the definition.
('reservation' can be a synonym of 'qualification')

I don't understand how the remainder of the clue works.

(Other definitions for reservations that I've seen before include "Doubts" , "suitable areas for Aboriginals" .)

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

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