Subtle point in Hellenic etymology (6)
I believe the answer is:
nicety
'subtle point' is the definition.
(I've seen this before)
'in hellenic etymology' is the wordplay.
'in' indicates a hidden word.
'NICETY' can be found hidden inside 'hellenic etymology'.
(Other definitions for nicety that I've seen before include "Matter of delicate adjustment" , "Degree of precision" , "shade?" , "Fine point or subtlety" , "Judged to a . . . . . . - with precision" .)