Veteran suffered (11)
I believe the answer is:
experienced
This could be a double definition.
'veteran' is the first definition.
(similar in meaning)
'suffered' is the second definition.
The answer and definition can be both related to change as well as being past participle verbs.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for experienced that I've seen before include "No novice" , "Practised, well-versed" , "Having wisdom gained through practice" , "Having much accumulated knowledge" , "went through" .)