Crossword Genius

Here one relaxes over many pints! (5,3)

Ross

I believe the answer is:

water bed

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'here one relaxes over many pints' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for water bed that I've seen before include "Fluid-filled mattress" , "Sleep on it" .)

I've seen this clue in The Sun.
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