Debauchery during junior gymnastics (4)
I believe the answer is:
orgy
'debauchery' is the definition.
('orgy' can be a synonym of 'debauchery')
'during junior gymnastics' is the wordplay.
'during' says the answer is hidden in the clue.
'ORGY' is hidden in the letters of 'junior gymnastics'.
(Other definitions for orgy that I've seen before include "Excess" , "Wild licentious party" , "Very intimate get-together" , "Bacchanal" , "Wild overindulgent party" .)