Crossword Genius

Upright (5)

Ross

'upright' is the definition.
(standing on end)

This is all the clue.

(Other definitions for on end that I've seen before include "Upturned, as a box" , "Erect; at a stretch" , "Continuing without stopping; upright" , "continuing in an upright position" , "Without pause" .)

I've seen this clue in The New York Times and the Evening Standard.
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