Something baker's made with yeast rose perhaps (7)
I believe the answer is:
bloomer
I believe this clue is a double definition.
'something baker's made with yeast' is the first definition.
(loaf of bread)
'rose perhaps' is the second definition.
(flower which blooms)
(Other definitions for bloomer that I've seen before include "Stupid mistake" , "made by a baker" , "rose, say" , "A loaf; an error" , "Large loaf; or, a mistake" .)