Peruser (6)
I believe the answer is:
reader
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">peruser</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for reader that I've seen before include "One who studies - or his book" , "Person perusing a book or newspaper" , "Publisher's selector" , "Times subscriber, perhaps?" , "University lecturer; book of educational extracts" .)