Speaker's entirely boring object (3)
I believe the answer is:
awl
'boring object' is the definition.
(tool for boring holes)
'speaker's entirely' is the wordplay.
'speaker's' shows a homophone (sound like).
'entirely' becomes 'all' (all can mean entirely or completely).
'all' sounds like 'AWL'.
(Other definitions for awl that I've seen before include "a boring person needs" , "Pointed hand tool" , "Instrument for boring holes" , "Cobbler's tool" , "Tool for punching small holes" .)