Former pupil or student (7)
I believe the answer is:
alumnus
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">former pupil</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">student</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that alumnus is a type of student)</span><br/ ><br/ ></span>
(Other definitions for alumnus that I've seen before include "Old pupil" , "US college old boy" , "Former college pupil" , "Former pupil or student" , "Ex-pupil" .)