Frolicsome leader? (7)
I believe the answer is:
skipper
'leader?' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for skipper that I've seen before include "sleep in outhouse" , "one that's put over the side" , "being in charge?" , "Ship's captain (colloq.)" , "team leader" .)