Revealed a number is to be performed (9)

I believe the answer is:

displayed

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'revealed' is the definition.
('display' can be a synonym of 'reveal')

'a number is to be performed' is the wordplay.
'a number' becomes 'd' (D is an example).
'to be performed' becomes 'played' (I can't explain this - if you can you should believe this answer much more).
'd'+'is'+'played'='DISPLAYED'

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(Other definitions for displayed that I've seen before include "Exhibited" , "Shown publicly" , "show" , "Showed" , "revealed" .)

I've seen this clue in The Globe and Mail.

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