A classic dream once shattered (9)
I believe the answer is:
decameron
'a classic' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'dream once shattered' is the wordplay.
'shattered' indicates an anagram.
'dream'+'once'='dreamonce'
'dreamonce' is an anagram of 'DECAMERON'.
Can you help me to learn more?
(Other definitions for decameron that I've seen before include "Boccaccio's best-known work" , "Boccaccio's tales" , "Collection of 100 short stories by Boccaccio - rename cod (anag)" , "14th century Italian book of tales" , "Collected tales" .)