Crossword Genius

Turn on radio for part played (4)

Ross

I believe the answer is:

role

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'for part played' is the definition.
I can't judge whether this definition defines the answer.

'turn on radio' is the wordplay.
'turn' becomes 'roll' (roll is a kind of turn).
'on radio' shows a homophone (sound like).
'roll' is a homophone of 'ROLE'.

Can you help me to learn more?

(Other definitions for role that I've seen before include "Playing part" , "Part, portrayal" , "Stage part" , "Impersonation" , "Duty" .)

I've seen this clue in The Sun.
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