At the crux of it, gymnast's cultivated, poetic style expresses lack of experience (7)

I believe the answer is:

naivety

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'lack of experience' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for naivety that I've seen before include "Quality of impractical innocence" , "artlessness" , "Lack of sophistication or experience" , "Ingenuousness" , "Navy tie? (anag)" .)

I've seen this clue in The Irish Times.

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