US singers making modest sums (5,4)
I believe the answer is:
petty cash
'us' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for petty cash that I've seen before include "Small fund for minor expenses" , "Money kept in office for small payments - it's trivial" , "Small amounts of money set aside for insignificant payments" , "Monetary fund" , "Ready to deal with minor damage" .)