Perhaps Clare Balding broadcast could be authentic (4)

I believe the answer is:

real

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'authentic' is the definition.
(authentic means real or genuine)

I can't explain the remainder of the clue.

(Other definitions for real that I've seen before include "---- Madrid, Spanish football club" , "Spanish football team" , "foreign currency" , "Madrid FC; genuine" , "Actual; coin" .)

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