Projection of Liberal superiority (5)
I believe the answer is:
ledge
'projection' is the definition.
(thesaurus)
'liberal superiority' is the wordplay.
'liberal' becomes 'l' (abbreviation).
'superiority' becomes 'edge' ('edge' can be a synonym of 'superiority').
'l'+'edge'='LEDGE'
'of' is the link.
(Other definitions for ledge that I've seen before include "Ability to contain one's emotions" , "Narrow projecting shelf, on cliff or building" , "Narrow projecting shelf as from window" , "Mantelpiece" , "Surface under e.g. window" .)