Lucky place to find butter? (2,1,4)
I believe the answer is:
on a roll
I'm afraid I can't even guess how this answer relates to 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" , "Being extremely jammy, maybe" , "having a lot of luck?" , "enjoying continuing success" , "Where toilet paper may be found" .)