I've left the beach to James (4)
I believe the answer is:
bond
'to james' is the definition.
(James Bond is a fictional spy)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bond that I've seen before include "Fictional agent; link" , "Link, connection" , "Fastening; secret agent" , "Fictional 25, associate of 18 20" , "Fellow feeling" .)