Important absence of diagram? (7)

I believe the answer is:

notable

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'important' is the definition.
(thesaurus)

'absence of diagram?' is the wordplay.
'absence of' becomes 'no'.
'diagram?' becomes 'table' (I can't explain this - if you can you should give a lot more credence to this answer).
'no'+'table'='NOTABLE'

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(Other definitions for notable that I've seen before include "Great" , "Eminent" , "Big noise" , "Famous or memorable" , "Prominent" .)

I've seen this clue in The Times.

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