Until by myself with a book (4)
I believe the answer is:
tome
'a book' is the definition.
(a tome is a book)
'until by myself' is the wordplay.
'until' becomes 'to' (I've seen this in other clues).
'by' is a charade indicator (letters next to each other).
'myself' becomes 'me'.
'to'+'me'='TOME'
'with' is the link.
(Other definitions for tome that I've seen before include "dictionary?" , "A hefty book" , "Hefty volume" , "Large and scholarly book" , "Large scholarly volume" .)