Lord’s men fall out in book (4,8)
I believe the answer is:
moll flanders
'book' is the definition.
(I've seen this before)
'lord's men fall out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'lords'+'men'+'fall'='lordsmenfall'
'lordsmenfall' anagrammed gives 'MOLL FLANDERS'.
'in' acts as a link.
(Other definitions for moll flanders that I've seen before include "titled woman" , "Adventuress" , "(Female) Defoe novel" , "Defoe romance" , "Book by Defoe" .)