Reasoned thinking (5)
I believe the answer is:
logic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reasoned thinking</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for logic that I've seen before include "Dialectics" , "The science of reasoning correctly" , "subject with 14 [ARGUMENTS]" , "4-ing" , "Reasonable judgement" .)