Prose composition (5)
I believe the answer is:
essay
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prose composition</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 essay that I've seen before include "Composition, paper, article" , "Attempt; written piece" , "Make an effort to write one" , "Scholarly work" , "Trial, piece of writing" .)