Stupid person or amusing eccentric? (9)
I believe the answer is:
ignoramus
'stupid person' is the definition.
(I've seen this before)
'or amusing eccentric?' is the wordplay.
'eccentric?' indicates anagramming the letters (I've seen 'eccentric' mean this).
'or'+'amusing'='oramusing'
'oramusing' is an anagram of 'IGNORAMUS'.
(Other definitions for ignoramus that I've seen before include "Dimwit" , "Idiot" , "one in a state of bliss?" , "Ron is a mug (anag.)" , "Ignorant person" .)