Gambolled (6)
I believe the answer is:
romped
'gambolled' is the definition.
('romp' can be a synonym of 'gambol')
This is all the clue.
(Other definitions for romped that I've seen before include "played with energy" , "cavorted" , "Red mop played happily" , "Got home so easily" , "Played in lively way as children do" .)