Green’s Dictionary of Slang

(Aus.) a girl, a girlfriend.

1904		Sydney Sportsman (Surry Hills, NSW) 17 Aug. 6/2: [They] are understood to have quarrelled over an ocean liner, which is short for clyna, which in turn means girl.
1905		Duke Tritton’s Letter n.p.: Straight wire, China, she was the most beautiful Ocean Liner I ever saw.
1912		Sport (Adelaide) 6 Jan. 8/4: Jim A. has lost his ‘ocean liner’; now drowns his sorrows at the Fountain.
2002		Pete’s Aussie Sl. Home Page 🌐 ocean liner: cliner, a girl.