Peanut butter purchase (3)
I believe the answer is:
jar
'peanut butter purchase' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for jar that I've seen before include "Container; be incongruous" , "Wide-mouthed vessel" , "Cylindrical container as for jam" , "Glass of beer; clash" , "Storage container" .)