Crossword Genius

Benign definition of water source? (4-7)

Ross

I believe the answer is:

well-meaning

I'm a little stuck... Click here to teach me more about this clue!

'benign' is the definition.
(thesaurus)

'definition of water source?' is the wordplay.
I cannot really see how this works, but
'definition' could be 'meaning' (I've seen this in another clue) and 'meaning' is found within the answer.
'water' could be 'well' (well water is a kind of water) and 'well' is located in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for well-meaning that I've seen is " Having good, if sometimes ill-advised, intentions".)

I've seen this clue in the Sydney Morning Herald.
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