Museum moving diamonds, admitting number yet to be counted (8)

I believe the answer is:

unsummed

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'to be counted' is the definition.
I can't tell whether this definition defines the answer.

'museum moving diamonds admitting number' is the wordplay.
'moving' indicates anagramming the letters (letters are moved around).
'diamonds' becomes 'd' (abbreviation in bridge say).
'admitting' indicates putting letters inside (admit can mean to welcome in or accept).
'number' becomes 'n' (n can represent any number).
'museum' anagrammed gives '[museum]'.
'[museum]'+'d'='usummed'
'usummed' going around 'n' is 'UNSUMMED'.

'yet' is the link.

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I've seen this clue in The Independent.

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