Crossword Genius

Number of contents (3)

Ross

I believe the answer is:

ten

'number' is the definition.
(ten is a number)

'of contents' is the wordplay.
'of' indicates a hidden word.
'TEN' is hidden in the letters of 'contents'.

(Other definitions for ten that I've seen before include "Figure" , "Roman numeral X" , "No of sides of a decagon" , "How many" , "Base of decimal system" .)

I've seen this clue in The Mirror.
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