Crossword Genius

Rendered under the influence (9)

Ross

I believe the answer is:

plastered

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'rendered' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for plastered that I've seen before include "Drunk (as a ceiling or wall may be)" , "under the table?" , "the worse for drink" , "incapable" , "Might ceilings be" .)

I've seen this clue in The Daily Express.
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