Longman Dictionary of Contemporary English - earner

~ n 1 someone who earns money for the job that they do  (high earner/low earner etc)  (Private childcare is still too expensive for the average earner. | wage earner)  (Most wage earners are paid by cheque.) 2 a nice little earner BrE informal something that earns you a lot of money  (They're onto a nice little earner with that roadside cafй.)