What is "practicer"

Practicer \Prac"ti*cer\, n. [Often written practiser.]

1. One who practices, or puts in practice; one who customarily performs certain acts.
   --South.

2. One who exercises a profession; a practitioner.

3. One who uses art or stratagem. [Obs.]
   --B. Jonson.

n. (alternative form of practiser English)