College dance, after which one has nothing left (7)
I believe the answer is:
balliol
'college' is the definition.
(Balliol College, Oxford)
'dance after which one has nothing left' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance).
'after which' becomes 'i' (I've seen this in other clues).
'one has' says to put letters next to each other.
'nothing' becomes 'O' (looks like zero - 0).
'left' becomes 'l' (common abbreviation).
'ball'+'i'+'o'+'l'='BALLIOL'
(Other definitions for balliol that I've seen before include "C13 Oxford college" , "Wycliffe and Jowett were both Masters of this Oxford college" .)