Call the telephone inventor (4)
I believe the answer is:
bell
I believe this clue is a double definition.
'call' is the first definition.
(I've seen this before)
'the telephone inventor' is the second definition.
(I've seen this in another clue)
(Other definitions for bell that I've seen before include "It rings when struck" , "Wide end of a trumpet" , "Metal ringer" , "Chime" , "bicycle accessory" .)