a nice little earner
From Longman Dictionary of Contemporary Englisha nice little earnera nice little earnerBritish English informalPROFIT something that earns you a lot of money → earnerExamples from the Corpusa nice little earner• That would be a nice little earner for us.• With an eye for a nice little earner, Del Trotter dictated his letter of application to chief sports writer Roy Collins.• It has become, let's face it, a nice little earner.• Some of the nurses found it a nice little earner on top of their poor weekly pay.• However worthy his motives, the good doctor is on a nice little earner.