Mischievous adventure (8)
I believe the answer is:
escapade
'mischievous adventure' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for escapade that I've seen before include "Madcap adventure" , "Adventurous T [TREAT]" , "Wild prank" , "Wild adventure" , "Antic" .)