Crossword Genius

They have good intentions but they're not willing to share source (4,4)

Ross

I believe the answer is:

mean well

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'intentions but they're not willing to share source' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'they have good' is the wordplay.
'they have' becomes 'mean' (I can't justify this - if you can you should give a lot more credence to this answer).
'good' becomes 'well' (synonyms).
'mean'+'well'='MEAN WELL'

Can you help me to learn more?

(Other definitions for mean well that I've seen before include "aim to please" , "Have good intentions but poor performance" , "Having intention to act properly" , "Want to he helpful" , "with good intention" .)

I've seen this clue in The Irish Times.
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