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Sister finally separating expert's head from body shows subtlety (6)

Ross

I believe the answer is:

nuance

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'subtlety' is the definition.
(synonyms)

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(Other definitions for nuance that I've seen before include "A slight shade as of meaning" , "Subtle difference of meaning" , "Ace nun (anag)" , "Subtle variation, in meaning say" , "Subtle distinction or variation" .)

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