A bit of her novel is set within Scotland's borders (5)
I believe the answer is:
shred
'a bit' is the definition.
(I know that bit can be written as shred)
'her novel is set within scotland's borders' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'her' is 'hre' which is within the answer.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for shred that I've seen before include "just a touch" , "Thin scrap or strip" , "Cut into small pieces" , "Tatter; small amount" , "Torn-off fragment" .)