Possible Clues:

• Keep making alterations to church by a pond preparing convert
• Keep swapping joint of meat with coppers
• Repeatedly vary one's preference
• Frequently vary what one may get at the butcher's?
• Move things around, often for no good reason
• Seesaw (metaphorically)
• Make alterations
• Blow hot and cold about work accepted by labourer before shift
• Keep on altering
• Keep making alterations