Sculpting giant head shows acidic quality (9)

I believe the answer is:

tanginess

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'acidic quality' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'sculpting giant head' is the wordplay.
'sculpting' indicates anagramming the letters (I've seen 'sculpt' mean this).
'head' becomes 'ness' (both can mean a promontory).
'giant' with letters rearranged gives 'tangi'.
'tangi'+'ness'='TANGINESS'

'shows' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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