Overturns brute's order (6)
I believe the answer is:
rebuts
'overturns' is the definition.
The definition and answer can be both related to thinking as well as being verbs in their -s form.
Perhaps there's a link between them I don't understand?
'brute's order' is the wordplay.
'order' indicates anagramming the letters.
'brutes' with letters rearranged gives 'REBUTS'.
Can you help me to learn more?
(Other definitions for rebuts that I've seen before include "Disproves or refutes, perhaps evidence" , "Drives back" , "Disproves a claim" .)