Chap with knowledge of the Borders (3)
I believe the answer is:
ken
This could be a double definition.
'chap' is the first definition.
(man's name)
'knowledge of the borders' is the second definition.
'ken' can be an answer for 'knowledge' (ken is a kind of knowledge). I'm unsure of the 'of the borders' bit.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for ken that I've seen before include "Understanding - boy's name" , "Notice" , "Know; man's name" , "Identify; -- Livingstone" , "One's range of knowledge" .)