Possible Clues:

• More than 27 across for protection
• More than fifty pound divided by a general
• Protective cover for worker, in general
• Topcoat for a painter
• Protective cover for sovereign
• More than a fifty-fifty chance of its being put on for work
• From one end to the other; garment that protects clothes
• O, my girl, you get fifty-fifty on top of everything else
• More than a double half-century for protection
• Garment