Don’s love of a clue I’d rewritten involving Newton (8)
I believe the answer is:
dulcinea
'don's love' is the definition.
(Dulcinea is Don Quixote's imaginary wife)
'a clue i'd rewritten involving newton' is the wordplay.
'rewritten' indicates anagramming the letters.
'involving' means one lot of letters goes inside another.
'newton' becomes 'N' (symbol for the scientific unit of force).
'a'+'clue'+'id'='aclueid'
'aclueid' is an anagram of 'dulciea'.
'dulciea' going around 'n' is 'DULCINEA'.
'of' acts as a link.
(Other definitions for dulcinea that I've seen before include "quixotic sweetheart" , "Quixote's ideal woman" , "Literary heroine" , "Don Quixote's love" , "Don Quixote's beloved" .)