Rock star duly abandoning core network (5)
I believe the answer is:
dylan
'rock star duly abandoning' is the definition.
I can't judge whether this definition defines the answer.
'core network' is the wordplay.
'core' becomes 'dy' (I can't justify this - if you can you should give a lot more credence to this answer).
'network' becomes 'LAN' (Local Area Network).
'dy'+'lan'='DYLAN'
Can you help me to learn more?
(Other definitions for dylan that I've seen before include "Bob Zimmerman" , "and 19: Welsh poet" , "Popular musician" , "Great Welsh poet . . . . . Thomas" , "Bob -, Blowin' in the Wind singer" .)