Potter, forename Dennis, once world champion (6)

I believe the answer is:

taylor

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

This clue might be a double definition.

'potter forename dennis' is the first definition.
The definition suggests a singular noun which matches the answer.

'world champion' is the second definition.
The definition suggests a singular noun which matches the answer.

'once' acts as a link.

Can you help me to learn more?

(Other definitions for taylor that I've seen before include "See 12" , "12th US president, Zachary" , "Elizabeth --, actor" , "Elizabeth -, actress" , "Hollywood actress" .)

I've seen this clue in the Evening Standard.

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