Money-spinner doesn't include Merinos - that's just loose change? (5)
I believe the answer is:
penny
'money' is the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for penny that I've seen before include "Girl" , "Denarius" , "One hundredth of a pound" , "Lancaster" , "Little bit of 18" .)