Crossword Genius

Orderly in train catches rebellious lout (7)

Ross

I believe the answer is:

regular

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'orderly' is the definition.
(similar in meaning)

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

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(Other definitions for regular that I've seen before include "orderly" , "Full-time soldier" , "Soldier - uniform" , "In accordance with a fixed order" , "Even - constant" .)

I've seen this clue in The Hindu.
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