Part of A.S.L.: Abbr.

AMER

Think of the first word in the full name of this sign-based communication system.

This clue asks for an abbreviation tied to American Sign Language, often shortened as A.S.L. The answer is "AMER," which stands for "American" in this context—just the first four letters of the word. It’s a straightforward abbreviation clue where the solver recognizes that "A.S.L." includes "American" as its first component.