Inferior fellow started to blossom (6)
I believe the answer is:
flower
'blossom' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for flower that I've seen before include "the best one can pick" , "River" , "Garden plant" , "prime of life" , "Don, say" .)