Pulverize potatoes (4)
I believe the answer is:
mash
'pulverize potatoes' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mash that I've seen before include "Crush into a soft, pulpy state" , "Crush; soft mixture" , "Pureed potatoes" , "food for animals" , "Food for horses" .)