Philosophy of reasoning (5)

I believe the answer is:

logic

(Other definitions for logic that I've seen before include "Reasonable judgement" , "Rigorous reasoning" , "good sense" , "Reasoned judgement" , "System of reasoning" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.