Crossword Genius

1000 smack dealers with time off for good behaviour (7)

Ross

I believe the answer is:

manners

'good behaviour' is the definition.
(polite behaviour)

I cannot understand how the rest of the clue works.

(Other definitions for manners that I've seen before include "Politeness", "Etiquette", "Courtesy", "Social conduct", "people at station, perhaps".)

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