Etonian's dad (5)
I believe the answer is:
pater
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">etonian's dad</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 pater that I've seen before include "Taper away like father" , "Walter --, English essayist; father" , "Old man" , "Our Father - . . . . . Noster" , "A posh father, from Latin" .)