Blood liquid (6)
I believe the answer is:
plasma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">blood liquid</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 plasma that I've seen before include "Screens of some TVs" , "Colourless fluid in which blood cells are suspended" , "A psalm (anag.)" , "Hot ionised gas" , "State" .)