Interred, a rogue learned new skills (9)
I believe the answer is:
retrained
'learned new skills' is the definition.
The definition suggests a past participle verb which matches the answer.
'interred a rogue' is the wordplay.
'rogue' indicates an anagram (letters go rogue).
'interred'+'a'='interreda'
'interreda' with letters rearranged gives 'RETRAINED'.
Can you help me to learn more?
(Other definitions for retrained that I've seen before include "On losing job, worker may be" , "prepared for a new role" , "made fit for new role" .)