Unemployed group of students after university education (6)
I believe the answer is:
unused
'unemployed' is the definition.
(thesaurus)
'group of students after university education' is the wordplay.
'group of students' becomes 'NUS' (National Union of Students).
'after' means one lot of letters go next to another.
'university' becomes 'U' (abbreviation as in UMass).
'education' becomes 'ed' (abbreviation - e.g. sex ed).
'nus' put after 'u' is 'unus'.
'unus'+'ed'='UNUSED'
(Other definitions for unused that I've seen before include "In mint condition" , "Not utilised" , "Mint, as new" , "Remaining: inexperienced" , "Left over" .)