Famous school (4)
I believe the answer is:
eton
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">famous school</span>' is the definition.<br/ ><span class="explanation-format__explanation">(English private school)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eton that I've seen before include "old school" , "Public school (sounds like 20)" , "College in Berkshire" , "Easy to understand" , "Public school near Windsor" .)