Pertaining to hearing (8)
(Other definitions for auditory that I've seen before include "as one hears" , "Relating to hearing" , "Related to the sense of hearing" , "Via the ears" .)
'pertaining to hearing' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aural that I've seen before include "Pertaining to the ear" , "Relating to the hearing organs" , "Relating to the ear" , "Relating to sense of hearing" , "To do with hearing or the ears" .)