Crossword Genius

Where hamburger should be successful? (2,1,4)

Ross

I believe the answer is:

on a roll

I believe this is a double definition.

'where hamburger should be' is the first definition.

'successful?' is the second definition.

(Other definitions for on a roll that I've seen before include "Having long spell of good luck" , "Going through a good patch" , "Enjoying good luck" , "Piano music was once stored here" , "enjoying lots of success" .)

I've seen this clue in the Sydney Morning Herald.
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