Earth's pull, in brief

ONEG

Think of the force that keeps you grounded, often measured in units named after a famous scientist—shortened to four letters.

"Earth's pull" refers to gravity, which is often abbreviated in crosswords. The clue adds "in brief" to signal a short form, and "ONEG" is a common crossword shorthand for "one G," where "G" stands for the force of gravity. It’s a bit of crossword-specific wordplay since "one G" isn’t widely used outside puzzles.