Want good spring after poor (4,4)

I believe the answer is:
mean well
'want good' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'spring after poor' is the wordplay.
'spring' becomes 'well' (both can mean a source of water).
'after' is a charade indicator (letters next to each other).
'poor' becomes 'mean' (similar in meaning).
'well' put after 'mean' is 'MEAN WELL'.
Can you help me to learn more?
(Other definitions for mean well that I've seen before include "Want to he helpful" , "Have good intentions but poor performance" , "aim to please" , "with good intention" , "Having intention to act properly" .)