Novel seeing them marvel somewhat (4)
I believe the answer is:
emma
'novel' is the definition.
(novel by Jane Austen)
'seeing them marvel somewhat' is the wordplay.
'somewhat' indicates a hidden word.
'EMMA' is hidden in the letters of 'seeing them marvel'.
(Other definitions for emma that I've seen before include "Flaubert's heroine" , "Jane Austen work - Ms Bunton, former Baby Spice" , "companion for Nelson" , "Mrs Bovary" , "Eponymous heroine" .)