Green’s Dictionary of Slang

cockies’ clip n.

also cocky’s clip
[rhy. sl.; ult. note Baker, The Australian Language (1945): ‘in rural slang a cocky’s clip is given to a sheep when practically every vestige of wool is removed by a shearer’]
(Aus.)

1. sheep dip.

[Aus]Baker Aus. Lang.

2. a pickpocket [= dip n.1 (3)].

[Aus]Baker Aus. Lang.
[Aus]Sun. Herald (Sydney) 5 Nov. 95/4: ‘Cockie’s clip’ for a pickpocket.
[Aus]G.W. Turner Eng. Lang. in Aus. and N.Z. 101: Cocky’s clip for a pickpocket or ‘dip’.
[Aus]Pete’s Aussie Sl. Home Page 🌐 cockies’ clip: a dip = a pickpocket.

3. a swim [= SE dip].

[Aus]Pete’s Aussie Sl. Home Page 🌐 cockies’ clip: a dip = [...] a swim.