intoxicated by head royal's title (8)

I believe the answer is:

highness

I'm a little stuck... Click here to teach me more about this clue!

'royal's title' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'intoxicated by head' is the wordplay.
'intoxicated' becomes 'high' (similar in meaning).
'by' is a charade indicator (letters next to each other).
'head' becomes 'ness' (both can mean a promontory).
'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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