Green’s Dictionary of Slang

clerked adj.

[SE clerk, such ‘learned’ figures were automatically distrusted by the illiterate masses]

soothed, gulled, imposed upon.

[UK]New Canting Dict. n.p.: clerk’d soothed, funn’d, imposed on; The Cull will not be Clerk’d, i.e. He will not be caught or taken by fair Words: Nothing can be done with him.
[UK]Bailey Universal Etym. Eng. Dict. [as cit. 1725].
[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK] ‘St Giles’s Greek’ in Sporting Mag. Dec. XIII 164/1: A poor old wiganowns flat was clerked at drop-a-cog by a couple of queer coves.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[UK]G. Kent Modern Flash Dict.
[UK]Flash Dict. in Sinks of London Laid Open.
[US]Matsell Vocabulum.
[Aus]Crowe Aus. Sl. Dict. 18: Clerked, imposed upon.