Youngster's bit of work for the ministry (5)
I believe the answer is:
minor
'youngster's' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for minor that I've seen before include "Insignificant" , "Deceptively realistic (art)" , "Inconsequential" , "Young person below voting age" , "Trivial" .)