Most of 13 down in Labour (4)

I believe the answer is:

work

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'labour' is the definition.
(I've seen this before)

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

(Other definitions for work that I've seen before include "Occupation" , "Tasks to be undertaken" , ". . . get on with serious business" , "Anything made or done" , "Earn a living" .)

I've seen this clue in the Irish Times.

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