For me "smarter" means only "better dressed". It's frustrating that things like "more intelligent" or "more clever" or even "cleverer" do not seem to be accepted.
More clever and more intelligent should also be accepted.
Added the "more" versions. "Cleverer" should also be accepted, but I couldn't get the system to accept it. Maybe Mizinamo can figure out what I'm missing.
Adding "cleverer" worked for me; perhaps it was a temporary hiccup.