Muddleheaded, mostly biased and wealthy (7)
I believe the answer is:
moneyed
'wealthy' is the definition.
(I know that wealthy can be written as moneyed)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for moneyed that I've seen before include "Mo' needy? (Anag)" , "Wealthy" , "Having means" , "rolling in it" , "Well-heeled" .)