Squoosh (4)
I believe the answer is:
mash
'squoosh' 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 "TV series" , "Pulped potatoes" , "Brew or infuse (tea)" , "Pureed potato" , "Black comedy film set in Korean War" .)