Crossword Genius

Forty co-wrote singular novel (3-5)

Ross

I believe the answer is:

two-score

'forty' is the definition.
(a score means twenty)

'co-wrote singular novel' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'novel' indicates an anagram (letters in a new or novel order).
'co'+'wrote'+'s'='cowrotes'
'cowrotes' with letters rearranged gives 'TWO-SCORE'.

I've seen this clue in The Times.
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