A range that can be heard (5)
I believe the answer is:
'that can be heard' is the definition.
(aural means relating to hearing)
'a range' is the wordplay.
'range' becomes 'ural' (I've seen this in other clues).
(Other definitions for aural that I've seen before include "Relating to sense of hearing" , "of air" , "To do with an ear or hearing" , "Hearing-related" , "of the listener" .)