: a writer of light or inferior verse
The teacher is Nira (Sarit Larry), a woman with a warm professional manner and pleasant, ordinary middle-class life. She has a son in the army, a daughter in high school and a devoted husband (Lior Raz) with a decent government job. As a hobby — or perhaps as a vehicle for unexpressed ambitions and frustrated desires — she attends a poetry workshop with other amateur versifiers.
— A. O. Scott, The New York Times, 30 July 2015
A versifier originally meant any poet, and to this day it's still used without slighting intent. To versify meant to write any verse, and then later, to write a treatment of something (such as tragedy) in verse form. The –ify ending to versify comes from Latin versificāre--ficāre is from facere, "to make"--and echoes other verbs of conversion, such as modify, amplify, or simplify. Occasionally this ending is used to inflate a verb with importance, such as in speechify to mean "to give a speech."
That might have been part of the reason behind the pejorative sense that versifier acquired by the time John Milton wrote, in 1642, "Rather nice and humerous in what was tolerable, then patient to read every drawling versifier."