Klarense is a sailor located on the south-easternmost dock of Port Sarim. He is the owner of the Lady Lumbridge, a ship which is in a state of disrepair.
He offers to sell the ship to an aspiring Dragon Slayer for 2,000 coins, including the services of cabin boy Jenkins for free. He warns them that the ship is not yet seaworthy as Port Sarim's shipbuilders are unreliable. Once the ship is sold and basic repairs are made, he leaves to become Port Sarim's first lifeguard.
Afterwards, he has a ship named the Klarense's Cruiser, which looks suspiciously like the Lady Lumbridge with the name painted over.
^Klarense, "Dragon Slayer", RuneScape. "Of course! I'm sure the work needed to do on it wouldn't be too expensive. How does 2,000 gold sound? I'll even throw in my cabin boy, Jenkins, for free! He'll swab the decks and splice the mainsails for you!"
^Klarense, "Dragon Slayer", RuneScape. "So, are you interested in buying a ship? Now, I'll be straight with you: She's not quite seaworthy right now, but give her a bit of work and she'll be the nippiest ship this side of Port Khazard."
^Klarense, "Dragon Slayer", RuneScape. "No, not really. Port Sarim's shipbuilders aren't very efficient so it could be quite a while."
^Klarense, "Dragon Slayer", RuneScape. "Oh, I'll be fine. I've got work as Port Sarim's first lifeguard!"