Potato choice (6)
I believe the answer is:
mashed
'potato choice' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mashed that I've seen before include "Crushed to a pulp" , "Reduced to small pieces by pounding" , "Reduced to pulp" , "Pulped or crushed as potatoes may be" , "Pulped as potatoes often are" .)