In my book (10)
I believe the answer is:
personally
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in my book</span>' is the definition.<br/ ><span class="explanation-format__explanation">('in my book' is said before a personal view)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for personally that I've seen before include "I think" , "Speaking for myself" , "in my opinion" , "in my book" , "as far as one is concerned" .)