Possible Clues:

• One continually moving house set about packing goods
• Snail at Chez Jacques
• Food served up to society during grace
• Sounds as if S gets loaded into the ship in the form of snail
• Set about what's in the hold at a snail's pace
• That's set in a mess around what's in the hold at a snail's pace
• What's in the ship gets set about at a snail's pace
• Edible French snail
• An edible snail from France
• Into the hold, into the set, at a snail's pace