Work on one's whisking technique? (5,5)

I believe the answer is:

gravy train

(Other definitions for gravy train that I've seen before include "Opportunity to make money" , "Situation making easy money (colloq.)" , "Scheme for easy money" , "easy opportunity of profit" , "Jobs with more perks than work" .)

I've seen this clue in The New York Times.

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