Written defence (8)
I believe the answer is:
apologia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">written defence</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 apologia that I've seen before include "Personal written defence" , "form of defence" , "Formal defence of belief or conduct" , "Written defence or vindication" , "Formal written defence of one's opinions/conduct" .)