Public schoolboy (7)
I believe the answer is:
etonian
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">public schoolboy</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 etonian that I've seen before include "English student" , "One educated at famous public school" , "Alumnus of famous English school" , "student in establishment?" , "Relating to one particular school" .)