1) Borax-transporting driver 2) Driver of a farm team 3) Driver of stubborn beasts 4) Driver of stubborn equines 5) Driver with a whip 6) Jack 7) Laborer 8) Labourer 9) Manual laborer 10) Mule driver 11) Mule skinner 12) Skinner Found on https://www.crosswordclues.com/clue/muleteer