Runs out of wreck. Everything is lost with inexperienced money-spinner (4,3)
I believe the answer is:
cash cow
'money-spinner' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cash cow that I've seen before include "Lucrative investment" , "Lucrative activity" , "Lucrative endeavour" , "Steady income provider" , "Money-maker" .)