Fretted (6)
I believe the answer is:
stewed
'fretted' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stewed that I've seen before include "canned" , "Cooked slowly" , "Drunk; cooked in pot" , "(Meat) simmered; (tea) over-infused" , "felt uneasy" .)