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Dull, taking top off, becoming flashy (4)

Ross

I believe the answer is:

loud

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'flashy' is the definition.
(synonyms)

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(Other definitions for loud that I've seen before include "Raucous" , "strongly audible" , "Blaring" , "Noisily showy?" , "Noisy or garish" .)

I've seen this clue in The Independent.
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