Uncool student (4)
I believe the answer is:
nerd
'uncool student' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nerd that I've seen before include "One lacking social skills" , "Sort of chap" , "Someone boring (about computers?)" , "Boring, trivia-obsessed type" , "Student who is ridiculed for studying excessively" .)