A range that can be heard (5)
I believe the answer is:
aural
'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).
'a'+'ural'='AURAL'
(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" .)