Prompt choking at a note in book (9)
I believe the answer is:
catalogue
'book' is the definition.
(catalogue is a kind of book)
'prompt choking at a note' is the wordplay.
'prompt' becomes 'cue' (cue can mean a prompt or signal).
'choking' indicates putting letters inside (inserted letters are choked or crushed).
'note' becomes 'log' ().
'at'+'a'+'log'='atalog'
'cue' going around 'atalog' is 'CATALOGUE'.
'in' is the link.
(Other definitions for catalogue that I've seen before include "From which we order" , "Brochure containing a list of goods for sale" , "(Ilustrated) list of items" , "Coagulate into kind of directory" , "List of items for sale" .)