Prude finding liar most devious (8)

I believe the answer is:

moralist

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'prude' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'liar most devious' is the wordplay.
'devious' indicates an anagram.
'liar'+'most'='liarmost'
'liarmost' anagrammed gives 'MORALIST'.

'finding' acts as a link.

Can you help me to learn more?

(Other definitions for moralist that I've seen before include "Ethical figure" , "Ail storm (anag)" , "principled person" , "Disciplinarian" , "Good teacher" .)

I've seen this clue in The Telegraph.

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