Critical subtlety in Germanic etymology (6)

I believe the answer is:

nicety

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'critical subtlety' is the definition.
'nicety' can be an answer for 'subtlety' (synonyms). I'm unsure of the 'critical' bit.

'in germanic etymology' is the wordplay.
'in' indicates a hidden word.
'NICETY' is hidden in the letters of 'germanic etymology'.

Can you help me to learn more?

(Other definitions for nicety that I've seen before include "Fastidiousness" , "Fine point or subtlety" , "Judge to a . . . . . . - with precision" , "Delicacy" , "Fine distinction" .)

I've seen this clue in The Telegraph.

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