Crossword Genius

On top of (4)

Ross

I believe the answer is:

upon

'on top of' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for upon that I've seen before include "On tope of" , "At a prescribed point in time" , "Straddling" , "Onto" , "Au courant" .)

I've seen this clue in The Mirror, The Star Tribune, The Times and the Evening Standard.
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