Green’s Dictionary of Slang

tricker n.

[SE trick, some form of pincers or expandable wedge; ‘engines of Iron so cunningly wrought, that he wil cut a barre of Iron in two with them’ (Greene, The Blacke Bookes Messenger, 1592)]

(UK Und.) a burglar’s tool, spec. a gadget used to force open a window.

Show quotations
[UK]Greene Second Part of Conny-Catching in Grosart (1881–3) X 86: In Combing Law. He that hooks, the Comber. He that watcheth, the Warpe. The hooke, the Combe. The good, Snappings. The gin to open the windowe, the Trickar.
[UK]Dekker Belman of London G: The Gin to open the window is a Tricker.