Privileged pupil traps southern national (8)
I believe the answer is:
estonian
'national' is the definition.
(I've seen this before)
'privileged pupil traps southern' is the wordplay.
'privileged pupil' becomes 'etonian' (I've seen this before. I am not sure about the 'privileged' bit.).
'traps' means one lot of letters goes inside another.
'southern' becomes 's' (abbreviation).
'etonian' enclosing 's' is 'ESTONIAN'.
Can you help me to learn more?
(Other definitions for estonian that I've seen before include "Balt" , "One from a Baltic state" , "Native of a Baltic republic" , "Baltic state native" , "European language" .)