Unhealthy paleness (6)
I believe the answer is:
pallor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unhealthy paleness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pallor that I've seen before include "showing whiteness" , "Lack of facial colour as from illness" , "Ashen complexion due to illness" , "Paleness of complexion" , "Colourlessness" .)