Lucrative enterprise (5-7)
I believe the answer is:
money-spinner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lucrative enterprise</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for money-spinner that I've seen before include "Nice little earner?" , "Profitable thing" , "Lucrative activity" , "Lucrative thing" , "Highly profitable enterprise" .)