Crossword Genius

Measure the depth of (5)

Ross

I believe the answer is:

plumb

'measure the depth of' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for plumb that I've seen before include "Utterly" , "Test alignment" , "Absolutely straight - sound" , "Lead weight; exactly" , "True" .)

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