Liqueur no one young at university initially identifies (5)
I believe the answer is:
noyau
'liqueur' is the definition.
(French liqueur)
'no one young at university initially identifies' is the wordplay.
'one young' becomes 'y'.
'initially identifies' suggests taking the first letters.
The initial letters of 'at university' is 'au'.
'no'+'y'+'au'='NOYAU'
(Other definitions for noyau that I've seen before include "Liquor made of brandy and nuts" , "Liqueur of brandy and peach kernels" , "Brandy flavoured with fruit kernels; an you (anag.)" , "French liqueur" .)