Endured, underwent (8)
I believe the answer is:
suffered
I believe this clue is a double definition.
'endured' is the first definition.
('suffer' can be a synonym of 'endure')
'underwent' is the second definition.
(suffering is a kind of undergoing)
(Other definitions for suffered that I've seen before include "endured pain" , "Experienced something unpleasant" , "Undergone" , "Endured, underwent" .)