Father Brown's creator (10)
I believe the answer is:
chesterton
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">father brown's creator</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 chesterton that I've seen before include "Catholic author" , "London-born writer" , "G K - -" , "Novelist who created Father Brown" , "English writer" .)