Biblical water baby (5)

I believe the answer is:

moses

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'biblical water baby' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is all the clue.

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(Other definitions for moses that I've seen before include "Liberator" , "Hebrew prophet who received the ten commandments" , "Brother of Aaron and Miriam." , "the tablet-taker?" , "He led the Jews from bondage in Egypt" .)

I've seen this clue in the Evening Standard.

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