Needing breaks? Could be Amazon job on the line (6,6)

I believe the answer is:

engine driver

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But I can't explain it at all! Could you help me understand?

(Other definitions for engine driver that I've seen before include "Once the dream career of schoolboys?" , "Footplate man" , "loco?" , "Railway worker" , "Railway employee" .)

I've seen this clue in The Guardian.

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