... where cheese may be cooking (2,1,4)
I believe the answer is:
on a roll
'be cooking' is the definition.
(I've seen this in another clue)
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 "Going through a good patch" , "thus far unbeaten competitor?" , "Piano music was once stored here" , "Where one may find sesame seeds" , "Enjoying much luck" .)