Green’s Dictionary of Slang

clink rig n.

[SE clink, the noise of tankards hit together + rig n.2 (1)]

(UK Und.) the stealing of tankards from taverns; thus clink rigger, one who steals tankards.

[UK]G. Parker View of Society II 176: Clink Rig. Stealing silver tankards, pints, &c.
[UK]Hotten Dict. of Modern Sl. etc.
[UK]Hotten Sl. Dict. 102: CLING-RIG [sic], stealing tankards from public-houses, &c.
[UK]Sl. Dict.
[UK]Barrère & Leland Dict. of Sl., Jargon and Cant.
[UK]Farmer & Henley Sl. and Its Analogues.