The term 'PRANKSTER's Ammo' can be broken down into two crossword solutions: PEAS (4 letters) and PEA (3 letters). PEAS is an acronym for 'Pranks, Excuses, Alibis, and Stories', which are all tools that a PRANKSTER might use to carry out their pranks. PEA is a vegetable, which is often used as a metaphor for something small or insignificant. In this context, it could refer to the small details that a PRANKSTER needs to pay attention to in order to successfully pull off a prank.