Its members show appreciation for money (6)
I believe the answer is:
claque
'money' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for claque that I've seen before include "Group hired to applaud someone" , "Group of followers hired to applaud at a performance" , "Group of people hired to applaud something" , "Hired-applause team" , "Group of hired applauders" .)