[jak-leg]Chiefly South Midland and Southern U.S.
  1. unskilled or untrained for one's work; amateur: a jackleg electrician.
  2. unscrupulous or without the accepted standards of one's profession: a jackleg lawyer.
  3. makeshift; temporary.
  1. an unskilled or unscrupulous itinerant worker or practitioner.

Origin of jackleg

1840–50, Americanism; perhaps jack1 + (black)leg
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of jackleg