Crossword Genius

A well-known Turner (4)

Ross

I believe the answer is:

tina

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

'turner' is the definition.
(Tina Turner, famous singer)

'a well-known' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
The remaining letters 'tin' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for tina that I've seen is " Ain't this a girl?".)

I've seen this clue in the Evening Standard.
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