Helen and Ruth unclothed by champion of alternative medicine (9)

I believe the answer is:

eleuthero

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'helen and ruth unclothed' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'champion of alternative medicine' is the wordplay.
I cannot quite understand how this works, but
'champion' could be 'hero' (synonyms) and 'hero' is found in the answer.
This explanation may well be incorrect...

'by' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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