Suppresses queens, replacing English nationalist with liberals (6)
I believe the answer is:
quells
'suppresses' is the definition.
(quelling is a kind of suppressing)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for quells that I've seen before include "Suppresses or crushes completely" , "Crushes or subdues" , "Allays" .)