Wealth is of little importance, son (5)
I believe the answer is:
means
This clue might be a double definition.
'wealth' is the first definition.
(I've seen this in another clue)
'of little importance son' is the second definition.
The definition suggests a singular noun which matches the answer.
'is' is the link.
Can you help me to learn more?
(Other definitions for means that I've seen before include "sufficient funds" , "Medium used to achieve a result" , "Intends; income" , "has significance" , "With which an end is achieved" .)