Dramatist, after casting she rejected Bottom (5)

I believe the answer is:
nadir
'bottom' is the definition.
(I've seen this before)
'dramatist after casting she rejected' is the wordplay.
I cannot really see how this works, but
'she' could be 'adi' and 'adi' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for nadir that I've seen before include "Rock bottom" , "Drain to lowest level" , "deep despair" , "Very bottom, farthest from zenith" , "Low point" .)
