Embitters one Republican motel owner Norman (9)
I believe the answer is:
acerbates
'embitters' is the definition.
('acerbate' can be a synonym of 'embitter')
'one republican motel owner norman' is the wordplay.
I cannot really understand how this works, but
'one' could be 'ace' (ace has a value of one in some card games) and 'ace' is present in the answer.
'republican' could be 'r' (abbreviation in US politics) and 'r' is present in the answer.
'motel owner' could be 'bates' (I've seen this before) and 'bates' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for acerbates that I've seen is " Makes sour".)