Range of hearing (7)
I believe the answer is:
earshot
'range of hearing' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for earshot that I've seen before include "catching distance?" , "Distance within which a sound can be heard" , "To share (anag)" , "Range over which one may hear or be heard" , "Hot ears (anag.)" .)