One simple design, or a museum piece? (9)
I believe the answer is:
ignoramus
'one simple' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'design or a museum piece?' is the wordplay.
'piece?' says the answer is hidden in the clue (I've seen 'piece' mean this).
'IGNORAMUS' is hidden in the letters of 'design or a museum'.
Can you help me to learn more?
(Other definitions for ignoramus that I've seen before include "Dimwit" , "Ron is a mug (anag.)" , "Ignorant person" , "Fool" , "Uninformed sort" .)