Crossword Genius

It should hold water (4)

Ross

I believe the answer is:

ewer

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This might be a double definition.

'it should' is the first definition.
The definition suggests a singular noun which matches the answer.

'hold water' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for ewer that I've seen before include "Large water-jug" , "29 [VESSEL]" , "Large, wide-mouthed jug" , "Big jug" , "A type of jug" .)

I've seen this clue in the Evening Standard.
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