Crossword Genius

Rendered senseless from drink (9)

Ross

I believe the answer is:

plastered

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.
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