Green’s Dictionary of Slang

Wells, The n.

(UK Und.) Clerkenwell Prison.

[UK]G.L. Chesterton Revelations of Prison Life I 22: The New Prison at Clerkenwell was styled ‘The Wells:’ Newgate, the ‘Stone jug:’ Horsemonger-Lane, ‘The Old Horse:’ and Tothill Fields, ‘The Tea Garden’.