Confused impression given by book publisher's commendatory comments (5)
I believe the answer is:
blurb
'publisher's commendatory comments' is the definition.
I can't tell whether this definition defines the answer.
'confused impression given by book' is the wordplay.
'confused impression' becomes 'blur' (I've seen this before).
'given' is a charade indicator (letters next to each other).
'by book' becomes 'b' (I am not sure about the 'by' bit.**).
'blur'+'b'='BLURB'
Can you help me to learn more?
(Other definitions for blurb that I've seen before include "Short description on book cover" , "printed on jacket" , "Commendations on book jacket" , "Enticing paragraph" , "Promotional statement on a book's dust jacket" .)