Abstract poem, about to disappear, is featured in book (9)
I believe the answer is:
'abstract poem' is the definition.
'epitomise' can be an answer for 'abstract' (abstract can mean to epitomise or summarise). I am unsure of the 'poem' bit.
'to disappear is featured in book' is the wordplay.
'to disappear' becomes 'epi' (I can't justify this - if you can you should give a lot more credence to this answer).
'featured in' indicates putting letters inside.
'book' becomes 'tome' (a tome is a book).
'is' inserted into 'tome' is 'tomise'.
'about' acts as a link.
Can you help me to learn more?
(Other definitions for epitomise that I've seen before include "to be a perfect example" , "Typify (S, not Z)" , "in a summary case" , "Act as representative" , "Embody perfectly a stated idea" .)