Rushes back across north shore (6)
I believe the answer is:
strand
'shore' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for strand that I've seen before include "Leave aground on shore" , "Bit of wire, say" , "Thread; leave in lurch" , "Scottish gutter" , "A thread or a sea shore" .)