Circus feature a proportion backed - radio broadcast for the rest? (7)

I believe the answer is:

trapeze

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'circus feature' is the definition.
(item used by acrobats in a circus)

I can't explain the rest of the clue.

(Other definitions for trapeze that I've seen before include "Swing used by circus acrobats" , "Circus attraction" , "Flying bar for acrobatics" , "Aerobatic device" , "Circus bar on ropes" .)

I've seen this clue in The Independent.

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