He may well appeal to the public (6)
I believe the answer is:
orator
'he may well' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'appeal to the public' is the wordplay.
I cannot quite understand how this works, but
'appeal' could be 'o' and 'o' is found in the answer.
'to' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for orator that I've seen before include "To roar at a speech-maker" , "A Rhetorical talker or speech-maker" , "Skilled public speaker" , "A fluent public speaker" , "Eloquent public speaker" .)