There’s a novel one by Galsworthy (4)
I believe the answer is:
saga
'galsworthy' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'there's a novel one by' is the wordplay.
'there's a novel' becomes 'sag' (I can't explain this - if you can you should give a lot more credence to this answer).
'one' becomes 'a'.
'by' is a charade indicator (letters next to each other).
'sag'+'a'='SAGA'
Can you help me to learn more?
(Other definitions for saga that I've seen before include "A long story or poem - it's a gas" , "Icelandic or Norse story" , "Long and involved story" , "Long detailed story" , "Long heroic tale" .)