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