Elaborate rhinestone not so natural (8)
I believe the answer is:
inherent
'natural' is the definition.
(I've seen this before)
'elaborate rhinestone not so' is the wordplay.
'elaborate' indicates an anagram (an elaborate version of the letters).
'not' is a deletion indicator.
'rhinestone' with 'so' removed is 'rhinetne'.
'rhinetne' anagrammed gives 'INHERENT'.
(Other definitions for inherent that I've seen before include "Necessary as a part" , "Innate, natural" , "essential" , "Built-in, integral" , "Existing permanently in something" .)