Green’s Dictionary of Slang

izzelly n.

[ety. unknown]

(UK Und.) an associate.

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[UK]Duncombe New and Improved Flash Dict.

In compounds

izzellywicket (n.) [? SE wicket in cricket]

(UK Und.) one who betrays their associates (to save their own life).

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[UK]Duncombe New and Improved Flash Dict. n.p.: Izzellywickets fellows who let out or betray the secrets of their companions, or who turn king’s evidence against them to save their own necks from the halter.