Crossword Genius

Where poppy seeds might be having a run of success (2,1,4)

Ross

I believe the answer is:

on a roll

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'having a run of success' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for on a roll that I've seen before include "Where ham may be" , "Having a run of good luck (colloq.)" , "keeps having repeated wins" , "Where toilet paper may be found" , "Having long spell of good luck" .)

I've seen this clue in The Telegraph.
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