Crossword Genius

Standing on queue reportedly following these characters (4)

Ross

I believe the answer is:

atop

I'm a little stuck... Click here to teach me more about this clue!

'standing on' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for atop that I've seen before include "Surmounting" , "On the peak" , "In superior position" , "At the summit of" , "highly placed" .)

I've seen this clue in The Irish 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.