With long novel one's late to bed (5,3)
I believe the answer is:
night owl
'one's late to bed' is the definition.
I can't judge whether this definition defines the answer.
'with long novel' is the wordplay.
'novel' indicates anagramming the letters (letters in a new or novel order).
'with'+'long'='withlong'
'withlong' with letters rearranged gives 'NIGHT-OWL'.
Can you help me to learn more?
(Other definitions for night owl that I've seen before include "Nocturnal human (with a bird)" , "One active after dark" , "Person who likes to be active late in the day" , "One preferring to work when it's dark" , "One working late" .)