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Lubricates drunken serenade, endlessly filling empty glass (7)

Ross

I believe the answer is:

greases

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'lubricates' is the definition.
('grease' can be a synonym of 'lubricate')

I can't explain the rest of the clue.

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(Other definitions for greases that I've seen before include "Lubricates" , "One of those animal products" , "Bribes" .)

I've seen this clue in The Guardian.
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