Crossword Genius

Job for a shipping company (4)

Ross

I believe the answer is:

line

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for line that I've seen before include "Wrinkle, boundary" , "Row; track" , "It's long relative to its width" , "Railway track; wrinkle" , "business" .)

I've seen this clue in The Globe and Mail.
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