A little less than a half cup

"Scant" is not a type of flour. "Scant" is a cooking term that means "almost" or "just slightly less than." A recipe would not call for "scant flour" but a "scant cup" or a "scant Tablespoon" of flour, meaning not quite a cup or not quite a Tablespoon.

A scant of sugar is a very small amount of sugar.

Ricky lee Jones is a scant singer....

Barely amounting to as much as indicated - example: a scant two hours; a scant cupful.

Having an inadequate or limited supply - example - (usually followed by of ): scant of breath.