Is the right number (6)

I believe the answer is:

twenty

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'number' is the definition.
(twenty is a kind of whole number)

I can't explain the remainder of the clue.

(Other definitions for twenty that I've seen before include "previous clue?" , "No. between 5 and 1 on dartboard" , "made by Q on a light blue square" , "Number" , "Figure" .)

I've seen this clue in the Evening Standard.

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