Brain-based (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
mental
'brain-based' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mental that I've seen before include "Crazy" , "like brain operation" , "Light allowing vehicles to turn while ahead is red" , "Cognitive" , "Pertaining to the mind" .)