"one who has but slight or superficial knowledge," 1510s, agent noun from smatter (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for smatterer
Don't spare study; if you will be a lawyer, become a good one, not a smatterer.Lewis Rand
At this explanation she shook her head, and observed that no smatterer could read as I had done.The Adventures of Roderick Random
Like Mr. Stevenson's smatterer, who was asked, "What would be the result of putting a pound of potassium in a pot of porter?"Adventures in Criticism
Sir Arthur Thomas Quiller-Couch
Any mere sciolist, any empiric, any smatterer of the new medical course—and where would Frank Gilham's arm be now?Perlycross
R. D. Blackmore
He was a smatterer of that most dangerous kind, who feel certain they have arrived at truth.