Crossword Genius

A bottom one couldn't possibly get beneath? (5)

Ross

I believe the answer is:

nadir

'a bottom' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for nadir that I've seen before include "Drain into the lowest point (5)" , "Lower one cannot get!" , "Low spot" , "Rock bottom" , "Dinar (anag.)" .)

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