Boil slowly (6)
'boil slowly' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for simmer that I've seen before include "Cook in gently boiling water" , "Keep just short of boiling point, water or temper" , "Bubble away" , "Seethe" , "Bubble gently just below boiling point" .)
'boil slowly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stew that I've seen before include "Slow-cooked meat dish; state of agitation" , "are nervous" , "Cassoulet" , "Dish of meat and mixed vegetables" , "anxious state" .)