1) Carrying out illicit actions in the night-time, whether it be distilling liquor or taking a second job (OED).

The examples quoted in dictionaries are no earlier than the nineteenth century but the term may owe its meaning to medieval guild practice of restricting work to the hours of daylight. In 1307, a grant was made to the girdlers in York on condition that nane of tham by na manere of harneys falland to gyrdels that es wroght by the mone light ... that na man of girdelercrafte ... wyrke ... bot by clere daylight.

places York
dates 1307

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