Bread purchase (4)
I believe the answer is:
loaf
'bread purchase' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loaf that I've seen before include "Bread; loiter" , "Hang around for bread?" , "Spend time idly, having slang head" , "Suffer loss of credibility" , "Idle - head" .)