Camels might end up here then if hour is spent off course (6)

I believe the answer is:

astray

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'off course' is the definition.
(to be led astray is to be led off course)

I can't explain the rest of the clue.

(Other definitions for astray that I've seen before include "(Gone) off course" , "Wandering, off course" , "on the wrong road" , "Wandering lost" , "Off one's route or lost" .)

I've seen this clue in The Independent.

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