Crossword Genius

How many are on number twenty? (9)

Ross

I believe the answer is:

fourscore

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'twenty?' is the definition.
(thesaurus)

'how many are on number' is the wordplay.
'how many are' becomes 'four' (I can't justify this - if you can you should believe this answer much more).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'number' becomes 'score' (score is a kind of number).
'four'+'score'='FOURSCORE'

Can you help me to learn more?

(Other definitions for fourscore that I've seen before include "number" , "Eighty" , "''... and seven years ago, our fathers.... (Gettysburg address)" .)

I've seen this clue in the Evening Standard.
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