Rebel cadet somehow becoming famous (10)
I believe the answer is:
celebrated
'famous' is the definition.
(I know that famous can be written as celebrated)
'rebel cadet somehow' is the wordplay.
'somehow' is an anagram indicator.
'rebel'+'cadet'='rebelcadet'
'rebelcadet' is an anagram of 'CELEBRATED'.
'becoming' is the link.
(Other definitions for celebrated that I've seen before include "Observed (festival); famous" , "Cheered" , "Did something enjoyable (to mark an event)" , "Publicly honoured" , "Rejoiced - famous" .)