Size between small and large: Abbr.

MED

Think of the middle option when ordering a coffee or shirt—it’s not the biggest or smallest, just right in between.

This clue asks for the abbreviation of the word that describes something in the middle of "small" and "large." The answer is "MED," short for "medium," which fits as the intermediate size. It’s a straightforward abbreviation clue with no wordplay—just a common term you’d see on clothing tags or menus.