Troublemaker needing small group of like-minded supporters (5)
I believe the answer is:
scamp
'troublemaker' is the definition.
(I know that scamp is a type of troublemaker)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for scamp that I've seen before include "Mischief-maker" , "Mischievous child (colloq.)" , "Troublemaker" , "Scallywag" , "Little Devil" .)