Mistake that's made by baker (7)
I believe the answer is:
bloomer
'mistake' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for bloomer that I've seen before include "Something from the baker" , "A loaf; an error" , "Large loaf; or, a mistake" , "rose, say" , "Big mistake" .)