Capitulated and opened top gate to a blood carrier (4,2)
I believe the answer is:
gave in
'capitulated' is the definition.
(to give in is to yield or capitulate)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for gave in that I've seen before include "Acceded, submitted" , "Ceased arguing" , "Yielded" .)