Source of Vitamin C', a novel composed with scope (11)

I believe the answer is:

navelorange

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'source of vitamin c'' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'a novel composed with scope' is the wordplay.
'composed' is an anagram indicator.
'with' means one lot of letters go next to another.
'scope' becomes 'range' (synonyms).
'a'+'novel'='anovel'
'anovel' is an anagram of 'navelo'.
'navelo'+'range'='NAVELORANGE'

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I've seen this clue in The Daily Express.

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