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Tasting success where jam goes? (2,1,4)

Ross

I believe the answer is:

on a roll

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'tasting success' is the definition.
'on a roll' can be an answer for 'success' (I've seen this before). I am not sure about the 'tasting' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for on a roll that I've seen before include "Enjoying much luck" , "Enjoying good luck" , "name could be found here?" , "Butter may be seen here" , "Experiencing a run of good form" .)

I've seen this clue in The Hindu.
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