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And, I guess, flashiness is out (9)

Ross

I believe the answer is:

gaudiness

I'm a little stuck... Click here to teach me more about this clue!

'out' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'and i guess flashiness' is the wordplay.
'and i guess' anagrams to 'GAUDINESS'.
But, I'm not clear how this is indicated.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for gaudiness that I've seen before include "Tasteless showiness" , "Ostentation" .)

I've seen this clue in the Evening Standard.
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