Student turning up with a curl of the lip? (5)
I believe the answer is:
pupil
'student' is the definition.
(pupil can mean a student at a school)
'turning up with a curl of the lip?' is the wordplay.
'turning' says the letters should be written backwards.
'with' means one lot of letters go next to another.
'a curl of' indicates anagramming the letters (I've seen 'curling' mean this (letters curl and twist out of order)).
'up' back-to-front is 'pu'.
'lip' anagrammed gives 'pil'.
'pu'+'pil'='PUPIL'
(Other definitions for pupil that I've seen before include "part of my anatomy" , "School learner" , "Learner at educational institution" , "Scholar" , "One studying" .)