Crossword Genius

Go off when people annoy, or ruffle (7)

Ross

I believe the answer is:

flounce

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'ruffle' is the definition.
(I know that ruffle can be written as flounce)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for flounce that I've seen before include "Preen - trimming" , "Exaggerated walk" , "Stamp" , "An impatient annoyed movement or a deep frill" , "Strut" .)

I've seen this clue in the Evening Standard.
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