Lose blood (5)
I believe the answer is:
bleed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lose blood</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bleed that I've seen before include "Shed blood" , "Haemorrhage" , "What would ancient doctor do" , "Lose life-sustaining fluid" , "Squeeze money out of" .)