Three points about king showing bias (4)
I believe the answer is:
skew
'bias' is the definition.
(synonyms)
'three points about king' is the wordplay.
'three points' becomes 'sew' ().
'about' indicates putting letters inside.
'king' becomes 'K' (chess abbreviation).
'sew' going around 'k' is 'SKEW'.
'showing' acts as a link.
(Other definitions for skew that I've seen before include "Place obliquely" , "Turn or twist around" , "Suddenly change direction or position" , "Turn or place at an angle; bias" , "Oblique, make crooked" .)