Lack of objectivity (4)
I believe the answer is:
bias
'lack of objectivity' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bias that I've seen before include "Prejudice, partiality" , "A leaning or prejudice" , "Prejudice, one-sidedness" , "Prejudice for one side" , "(Bowls) irregular shape" .)