Some poem: maybe classic work (4)
I believe the answer is:
emma
'classic work' is the definition.
(I've seen this before)
'some poem maybe' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'EMMA' is hidden within 'poem maybe'.
(Other definitions for emma that I've seen before include "Jane Austen novel and Nelson's lover" , "Eponymous heroine" , "Mrs Bovary" , "heroine of novel" , "young woman in novel" .)