Possible Clues:

• Structure on stern of ship is overweight when erected - and weak
• Found on a ship aft, perhaps, and fragile
• Staggering aft, infirm sailor may grasp it
• River transport for Captain Dorling
• Part of ship's timbers is reverse of plump, and feeble
• Scent enveloping a couple of females in bar at rear of ship
• This will turn overweight, delicate and stern on board
• Stern guard from Welsh train company?
• Back to overweight and weak on board
• Stern surroundings makes one turn fat and weak