Crossword Genius

Don't leave unescorted from stable (6)

Ross

I believe the answer is:

secure

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'stable' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for secure that I've seen before include "Free from danger and financially sound" , "Obtain - safe" , "lock" , "Stable" , "Safe and unthreatened" .)

I've seen this clue in the Irish Times.
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