The colour of blood? (5,4)
I believe the answer is:
royal blue
'the colour' is the definition.
(royal blue is a kind of colour)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for royal blue that I've seen before include "Bally euro (anag.)" , "A shade Conservative" , "(Regal?) colour" , "Queen's shade?" , "Deep rich shade of colour" .)