Tell them to abandon new design of barrel vault, though it shows brilliant technical skill (7)

I believe the answer is:

bravura

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'technical skill' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

(Other definitions for bravura that I've seen before include "Panache; daring" , "Display of great daring" , "Show of daring or brilliance" , "Great skill and brilliance in performance" , "Style of music requiring brilliant technique" .)

I've seen this clue in The Irish Times.

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