Ballerina ignores bill from the sports hall (5)

I believe the answer is:

arena

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'hall' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for arena that I've seen before include "Olympic venue?" , "O2, for example" , "Field of battle" , "Venue for boxing, circus and other action events" , "Place of public contest" .)

I've seen this clue in the Irish Times.

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