Growing source of money? (4)
I believe the answer is:
mint
'growing source' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?
'money?' is the wordplay.
I cannot really see how this works, but
'money?' could be 'm' (abbreviation in economics) and 'm' is found in the answer.
The remaining letters 'int' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for mint that I've seen before include "Coinage producer" , "Grown in the herb garden" , "Coin-making place or nice lamb sauce" , "Building where coin money is made (4)" , "There's a lot of money" .)