Toil Bert recollected, producing book (8)
I believe the answer is:
libretto
'book' is the definition.
(libretto is a kind of book)
'toil bert recollected' is the wordplay.
'recollected' indicates anagramming the letters.
'toil'+'bert'='toilbert'
'toilbert' is an anagram of 'LIBRETTO'.
'producing' acts as a link.
(Other definitions for libretto that I've seen before include "Operatic text" , "textbook" , "Words set to music, especially opera" , "text for musicians" , "Book of words of a musical" .)