Strange, mostly ignorant liberal (6)
I believe the answer is:
unreal
'strange mostly ignorant liberal' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I don't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for unreal that I've seen before include "Not true to life" , "Existing only in the imagination, not actual" , "Not actual or credible" , "Illusory; amazing" , "Illusory, imaginary" .)