intoxicated by head royal's title (8)

I believe the answer is:

highness

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'royal's title' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'intoxicated by head' is the wordplay.
'intoxicated' becomes 'high' (similar in meaning).
'by' means one lot of letters go next to another.
'head' becomes 'ness' (ness is a headland).
'high'+'ness'='HIGHNESS'

Can you help me to learn more?

(Another definition for highness that I've seen is " Title used to address a royal".)

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