broadsman

broad +‎ -s- +‎ -man, from broad (“a playing card”).

broadsman (plural broadsmen)

1. (UK, slang) A cardsharp.
   • 1931, The Police Journal, volume 4, page 504:

     In order better to appreciate the use of argot among thieves, a visit to a few public bars of the third-class public houses of Kennington or in the immediate vicinity of the Elephant and Castle would prove of great value, as hoisters, whizzers, tea-leaves, con-heads, broadsmen and brass nobs […]

• Boardmans, boardsman