Undergo (6)
'undergo' is the definition.
(suffering is a kind of undergoing)
This is all the clue.
(Other definitions for suffer that I've seen before include "Put up with" , "Experience; tolerate" , "Endure; hurt" , "Undergo pain or hardship" , "Experience (something bad)" .)
'undergo' is the definition.
(synonyms)
This is all the clue.
(Other definitions for experience that I've seen before include "What one has been through and is supposed to learn from" , "Suffer from" , "what Hendrix had" , "Go through" , "Encounter" .)