Enjoying a winning streak (2,1,4)

I think it could be either:

Which length description are you looking for?:

2,1,4

on a roll

'enjoying a winning streak' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for on a roll that I've seen before include "Piano music was once stored here" , "Enjoying much luck" , "Where ham may be" , "Where one lists people" , "Being extremely jammy, maybe" .)

I've seen this clue in The Guardian.

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