Simmered (6)
I believe the answer is:
stewed
'simmered' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stewed that I've seen before include "casseroled!" , "felt uneasy" , "Slowly boiled" , "Cooked (prunes?)" , "Drunk; cooked in pot" .)