Reduce to a pulp (4)
I believe the answer is:
mash
'reduce to a pulp' 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 "Brew or infuse (tea)" , "Reduce to pulp" , "Pulped potatoes" , "food for animals" , "TV series" .)