Crossword Genius

Those who cannot keep straight go off them (5)

Ross

I believe the answer is:

rails

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If this is the answer I cannot explain how the clue works.

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(Other definitions for rails that I've seen before include "Makes a protest" , "Tracks or barriers" , "Wading birds - dysfunctional person has come off them" , "Barriers of horizontal bars and supports" , "secretive birds" .)

I've seen this clue in The Irish News.
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