Blend into a thick liquid (5)
I believe the answer is:
puree
'blend into a thick liquid' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for puree that I've seen before include "Smooth cream of liquidized or crushed fruit or vegetables" , "Liquidised fruit/veg pulp" , "Smooth pulped food" , "Pulped fruit/veg" , "Fruit pulp" .)