Rocky with cast sinks wine being drunk (8)

I believe the answer is:

inkiness

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'drunk' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'rocky with cast sinks wine' is the wordplay.
'rocky' is an anagram indicator.
'with' becomes 'w' (abbreviation).
'cast' indicates named letters should be taken away.
'sinks'+'wine'='sinkswine'
'sinkswine' with 'w' removed is 'sinksine'.
'sinksine' is an anagram of 'INKINESS'.

'being' acts as a link.

Can you help me to learn more?

(Another definition for inkiness that I've seen is " Darkness".)

I've seen this clue in The Times.

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