Bloodless (7)
I believe the answer is:
anaemic
'bloodless' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for anaemic that I've seen before include "Lacking in red corpuscles" , "Suffering from lack of red corpuscles in blood" , "Deficient in red cells" , "strangely pale" , "Pallid, lacking vigour or colour" .)