School student (5)
I believe the answer is:
pupil
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">school student</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pupil that I've seen before include "Schoolchild; part of eye" , "feature in "Observer"?" , "Learner in the eye?" , "The sort of student" , "Learner at educational institution" .)