It's eaten, but one can have water with it (5)

I believe the answer is:

melon

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

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(Other definitions for melon that I've seen before include "Killing" , "Ogen or cantaloupe, for instance" , "Honeydew fruit" , "Type of pepo" , "Large vine fruit" .)

I've seen this clue in the Evening Standard.

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