Bad blood openly examined, emptying in marrow (6)
I believe the answer is:
enmity
'bad blood' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for enmity that I've seen before include "Bad blood" , "ill will" , "Hostility, bad feeling towards" , "Hatred, hostility" , "Hostility between opposing people or countries" .)