Crossword Genius

Switch edges on dresses? That's rational (5)

Ross

I believe the answer is:

sober

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'rational' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for sober that I've seen before include "Unintoxicated" , "Not intoxicated" , "Temperate" , "Dry - dull" , "Abstemious - grave" .)

I've seen this clue in The Guardian.
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