Victor from a German bloodline (4)
I believe the answer is:
vein
'bloodline' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'victor from a german' is the wordplay.
'victor' becomes 'v' (phonetic alphabet: alpha, bravo, charlie etc.).
'from' means one lot of letters go next to another.
'a german' becomes 'ein' ('a' in German).
'v'+'ein'='VEIN'
Can you help me to learn more?
(Other definitions for vein that I've seen before include "Deposit of mineral" , "Leaf rib; ore layer in rock" , "Irregular streak of colour" , "part of body" , "Part of the blood circulation system" .)