Possible Clues:

• Boat across e.g. English Channel
• Charon's charge
• Charon's carrier
• Long Beach-to-Catalina transport
• Boat that provides transport over stretch of water
• You'd do wrong to be in that sort of a boat
• Boat crossing water
• Boat for transferring people across short stretches of water
• Small fish has to upset the queen's shuttle
• Boat that carries clients across a stretch of water