Crossword Genius

Runs sale without a flap (7)

Ross

I believe the answer is:

ruction

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'flap' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for ruction that I've seen before include "Find a disturbance in cut iron" , "In court (anag.)" , "Ruckus, rumpus" , "Disturbance, quarrel" , "Uproar" .)

I've seen this clue in the Sydney Morning Herald.
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