Bright young man on the radio (5)

I believe the answer is:

sunny

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'bright' is the definition.
('sunny' can be similar in meaning to 'bright')

I can't explain the rest of the clue.

(Other definitions for sunny that I've seen before include "Unclouded - cheerful" , "Genial, cheerful" , "Bright and warm" , "cheerful sound" , "Cheerful; fine (weather)" .)

I've seen this clue in The Independent.

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