Given this, heir's now drunk on power (9)

I believe the answer is:

ownership

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'given this' is the definition.
The definition suggests a singular noun which matches the answer.

'heir's now drunk on power' is the wordplay.
'drunk' indicates anagramming the letters.
'on' says to put letters next to each other.
'power' becomes 'p' (symbol in physics).
'heirs'+'now'='heirsnow'
'heirsnow' anagrammed gives 'ownershi'.
'ownershi'+'p'='OWNERSHIP'

Can you help me to learn more?

(Other definitions for ownership that I've seen before include "Legal title" , "The right of possessing something" , "Proprietary right of possession" , "Proprietorship, possession" .)

I've seen this clue in The Independent.

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