Frenzied sex over before period of abstinence (7)
I believe the answer is:
violent
'frenzied' is the definition.
(frenzied can mean violent or frantic)
'sex over before period of abstinence' is the wordplay.
'sex' becomes 'VI' ('sex' is Latin for 'six' or VI in Roman numerals).
'over' becomes 'o' (cricket abbreviation).
'before' says to put letters next to each other.
'period of abstinence' becomes 'lent' (I've seen this before).
'vi'+'o'+'lent'='VIOLENT'
(Other definitions for violent that I've seen before include "Wild - not evil (anag)" , "Hot-headed" , "Immoderate" , "Tending to use intimidatory force" , "Vehement; unrestrained" .)