Waster reformed by George Moore's Esther (6)

I believe the answer is:

waters

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'george moore's esther' is the definition.
I can't tell whether this defines the answer.

'waster reformed' is the wordplay.
'reformed' indicates an anagram.
'waster' with letters rearranged gives 'WATERS'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for waters that I've seen before include "floods" , "Muddy - - (blues singer)" , "Sprinkles" , "(Of the mouth) salivates" , "What may be taken at a spa" .)

I've seen this clue in the Evening Standard.

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