Change, as a legislative bill

AMEND

Think of how lawmakers might tweak a proposed law before it passes—this five-letter word starts with "A" and means to modify formally.

The clue is a straightforward definition where "change" hints at modifying something, and "as a legislative bill" points to the legal process. In lawmaking, bills are often altered or updated, and the word for that action is "amend." There’s no wordplay here—it’s a direct reference to how laws get adjusted before becoming official.