Crossword Genius

Put the flags out, with pattern done another way (5,3,4,3)

Ross

I believe the answer is:

paint the town red

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But I can't explain it at all! Could you help me understand?

(Other definitions for paint the town red that I've seen before include "Celebrate" , "Go on a pub crawl" , "get rid of the blues?" , "enjoy celebration" .)

I've seen this clue in The Telegraph.
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