Law-abiding members, being very wealthy, have five together in the same suit (8,5)
I believe the answer is:
straight flush
'law-abiding members being' is the definition.
The definition suggests a singular noun which matches the answer.
'wealthy have five together in the same suit' is the wordplay.
I cannot quite see how this works, but
'wealthy' could be 'flush' (synonyms) and 'flush' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'very' acts as a link.
Can you help me to learn more?
(Other definitions for straight flush that I've seen before include "Good poker hand" , "Good group of clubs" , "Powerful hand at poker" , "In poker, five consecutive cards of the same suit" , "Gambler's hand that should win" .)