With continuing success, have jam here? (2,1,4)
I believe the answer is:
on a roll
'with continuing success' is the definition.
'on a roll' can be an answer for 'success' (I've seen this before). I'm unsure of the 'with continuing' bit.
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 "Enjoying a winning streak" , "Hitting a purple patch (as bacon might be?)" , "having a lot of luck?" , "Piano music was once stored here" , "Experiencing a run of good form" .)