Rollick (6)
I believe the answer is:
cavort
'rollick' is the definition.
(I know that cavort is a action)
This is the entire clue.
(Other definitions for cavort that I've seen before include "Caper about excitedly" , "Romp rowdily, frolic" , "Caper, gambol" , "be frolicsome" , "Frolic joyfully" .)