Go with coda in novel - it's Portrait of a Lady (8)
I believe the answer is:
gioconda
'portrait of a lady' is the definition.
The definition suggests a singular noun which matches the answer.
'go with coda in novel' is the wordplay.
'with' says to put letters next to each other.
'novel' is an anagram indicator (letters in a new or novel order).
'coda'+'in'='codain'
'go' after 'codain' is 'codaingo'.
'codaingo' with letters rearranged gives 'GIOCONDA'.
'it's' acts as a link.
Can you help me to learn more?
(Another definition for gioconda that I've seen is " Portrait more commonly called 'Mona Lisa'".)