Crossword Genius

Looking down on sixteen characters (4)

Ross

I believe the answer is:

atop

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

I don't understand how the rest of the clue works.

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(Other definitions for atop that I've seen before include "Upon" , "in dominant position" , "At the apex" , "On a high" , "At the summit of" .)

I've seen this clue in The Independent.
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