Solver's received affection, speaking out for English partisan (7)
I believe the answer is:
yorkist
'english partisan' is the definition.
I don't understand how the rest of the clue works.
(Other definitions for yorkist that I've seen before include "Lancastrian's enemy" , "Wars of the Roses partisan" , "Supporter of white rose in the Wars of the Roses" , "On side of white rose" , "opposing Lancaster" .)