Enjoying continued success (2,1,4)

I think it could be either:

Which length description are you looking for?:

2,1,4

on a roll

(Other definitions for on a roll that I've seen before include "How butter may be spread" , "Enjoying a winning streak" , "Having a run of success" , "Having long spell of good luck" , "Hitting a purple patch (as bacon might be?)" .)

I've seen this clue in The Mirror.

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