State ... "Shame about Diana showing tastiness" (8)

I believe the answer is:

sapidity

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'tastiness' is the definition.
(sapidity is the quality of having flavour)

'state shame about diana' is the wordplay.
'state' becomes 'sa' (I am not sure about this - if you are sure you should believe this answer much more).
'shame' becomes 'pity' (synonyms).
'about' means one lot of letters goes inside another.
'diana' becomes 'Di' (Di is short for Diana).
'pity' placed around 'di' is 'pidity'.
'sa'+'pidity'='SAPIDITY'

'showing' is the link.

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I've seen this clue in the Sydney Morning Herald.

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