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Past one's best, left to admit defeat on the radio (4,2,4)

Ross

I believe the answer is:

gone to seed

'past one's best' is the definition.
(both can mean decreased in quality)

'left to admit defeat on the radio' is the wordplay.
'left' becomes 'gone' (go can mean to leave).
'admit defeat' becomes 'cede' (to cede is to surrender).
'on the radio' shows a homophone (sound like).
'cede' sounds like 'seed'.
'gone'+'to'+'seed'='GONE TO SEED'

(Another definition for gone to seed that I've seen is " Deteriorated in condition".)

I've seen this clue in The Guardian.
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