Discriminatory (6)
(Other definitions for biased that I've seen before include "Favouring one person or side over another" , "Having prejudice" , "favouring a particular idea" , "'One-sided, slanted (6)'" , "Having favourite" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">discriminatory</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for unfair that I've seen before include "out of order" , "Swizz!" , "Partisan" , "'Unjust, inequitable (6)'" , "deceitful" .)
(Another definition for prejudicial that I've seen is " Harmful, detrimental".)