Kevin plays broken cornets! (7)

I believe the answer is:

costner

I'm a little stuck... Click here to teach me more about this clue!

'kevin plays' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'broken cornets' is the wordplay.
'broken' indicates an anagram.
'cornets' is an anagram of 'COSTNER'.

Can you help me to learn more?

(Another definition for costner that I've seen is " US actor".)

I've seen this clue in the Evening Standard.

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