Brand new university students meeting press chief (6)
I believe the answer is:
unused
'brand new' is the definition.
(something brand new has not been used)
'university students meeting press chief' is the wordplay.
'university' becomes 'u' (abbreviation for university).
'students' becomes 'nus' (I've seen this before).
'meeting' is a charade indicator (letters next to each other).
'press chief' becomes 'ed' (editor).
'u'+'nus'+'ed'='UNUSED'
(Other definitions for unused that I've seen before include "Extra" , "Pristine" , "Unaccustomed" , "Left over" , "Not utilised" .)