On a very tiny scale (9)
I believe the answer is:
subatomic
(Other definitions for subatomic that I've seen before include "Of smaller than elementary particles" , "Smaller than a basic particle of matter" , "Like 9 across" .)
I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.