Bush with sharp spines: son lost much blood (4)
I believe the answer is:
gore
'blood' is the definition.
(gore means blood or violence)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for gore that I've seen before include "piece of material" , "Blood; stab with tusk" , "Pierce with horn - blood" , "Poetic blood from Al?" , "Spilt blood" .)