Humiliated in commercial intended to entertain politician's supporters (6)
I believe the answer is:
abased
'humiliated' is the definition.
('abase' can be a synonym of 'humiliate')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for abased that I've seen before include "Demeaned (oneself)" , "Degraded, brought low" , "Put down" , "Humbled, mortified" , "Disgraced" .)