Got up repetitively quoting Gertrude Stein! (5)
I believe the answer is:
arose
'got up' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for arose that I've seen before include "Got out of bed" , "Sprang up" , "Originated (from)" , "Came about" , "Cropped up" .)