Certain English student (7)
I believe the answer is:
etonian
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">certain english student</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for etonian that I've seen before include "student in establishment?" , "Relating to one particular school" , "Public school boy" , "One educated at famous public school" , "English student" .)