Some people quit Yorkshire, showing fair-mindedness (6)
I believe the answer is:
equity
'fair-mindedness' is the definition.
(thesaurus)
'some people quit yorkshire' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'EQUITY' can be found hidden inside 'people quit yorkshire'.
'showing' acts as a link.
(Other definitions for equity that I've seen before include "Even-handedness" , "Fairness for actors' trade union" , "Fairness, impartial treatment" , "One trade union" , "Fairness or impartiality" .)