Well-reasoned (4)
'well-reasoned' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for logical that I've seen before include "Deducible" , "entirely reasonable" , "Following correct reasoning" , "Deductive" , "According with reason" .)
I believe this is a double definition.
'well' is the first definition.
(thesaurus)
'reasoned' is the second definition.
(I've seen this in another clue)
(Other definitions for sane that I've seen before include "Normal" , "Mentally healthy" , "Mentally sound" , "In full possession of mental faculties" , "Compos mentis" .)