Left university smashing champagne glass (5)
I believe the answer is:
flute
'champagne glass' is the definition.
(I've seen this before)
'left university smashing' is the wordplay.
'university' becomes 'u' (abbreviation for university).
'smashing' indicates an anagram.
'left'+'u'='leftu'
'leftu' anagrammed gives 'FLUTE'.
(Other definitions for flute that I've seen before include "Champagne glass" , "Wine glass; instrument" , "Musical instrument - wineglass" , "Wind instrument" , "High-pitched woodwind instrument" .)