Learned paper (8)
I believe the answer is:
treatise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">learned paper</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 treatise that I've seen before include "Formal piece of writing on a particular subject" , "Academic composition" , "Essay on theme" , "Written study" , "Learned written work" .)