Crossword Genius

Musical tenor quits old form of Islam (3,7)

Ross

I believe the answer is:

cat stevens

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'old form of islam' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'musical tenor quits' is the wordplay.
'musical' becomes 'Cats' (Andrew Lloyd Webber musical).
'tenor' becomes 't'.
'quits' becomes 'evens' (as in 'call it quits').
'cats'+'t'+'evens'='CAT STEVENS'

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I've seen this clue in The Times and The Sunday Times.
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