Drunk on beer, royal knocked over editor (7)

I believe the answer is:

lagered

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'drunk on beer' is the definition.
The definition suggests a past participle verb which matches the answer.

'royal knocked over editor' is the wordplay.
'royal' becomes 'regal' (synonyms).
'knocked' shows that the letters should be reversed in order (I've seen 'knocking' mean this).
'over editor' becomes 'ed' (abbreviation. I am not sure about the 'over' bit.).
'regal' reversed gives 'lager'.
'lager'+'ed'='LAGERED'

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I've seen this clue in The Independent.

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