Pulverize, as potatoes (4)
I believe the answer is:
mash
'pulverize as potatoes' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mash that I've seen before include "Pummel" , "food for animals" , "It goes well with sausages" , "Pured potato" , "TV series" .)