Crossword Genius

Perfectly vertical (5)

Ross

I believe the answer is:

plumb

'perfectly vertical' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for plumb that I've seen before include "Lead weight; exactly" , "Weight to show vertical direction" , "Connect pipes" , "Dead" , "Get to the bottom of the matter or depths" .)

I've seen this clue in the Universal, the USA Today and the New York Times.
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