New journalist follows posh students (6)
I believe the answer is:
unused
'new' is the definition.
('unused' can be similar in meaning to 'new')
'journalist follows posh students' is the wordplay.
'journalist' becomes 'ed' (short for editor).
'follows' is a charade indicator (letters next to each other).
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-u).
'students' becomes 'nus' (I've seen this in other clues).
'u'+'nus'='unus'
'ed' after 'unus' is 'UNUSED'.
(Other definitions for unused that I've seen before include "Surplus" , "In mint condition" , "factory fresh" , "Extra" , "Pristine" .)