Cleanliness advocates doctor insight? Yes! (10)

I believe the answer is:

hygienists

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'cleanliness advocates' is the definition.
The definition suggests a plural noun which matches the answer.

'doctor insight? yes' is the wordplay.
'doctor' is an anagram indicator.
'insight'+'yes'='insightyes'
'insightyes' is an anagram of 'HYGIENISTS'.

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I've seen this clue in The Hindu.

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