Cooks foods in frozen cases, and falls asleep (4,3)
I believe the answer is:
nods off
'falls asleep' is the definition.
('nod off' can be a synonym of 'fall asleep')
'cooks foods in frozen cases' is the wordplay.
'cooks' indicates an anagram.
'in' is an insertion indicator.
'frozen cases' becomes 'nf' (I am not sure about this - if you are sure you should believe this answer much more).
'foods' with letters rearranged gives 'odsof'.
'odsof' put into 'nf' is 'NODS OFF'.
'and' is the link.
Can you help me to learn more?
(Other definitions for nods off that I've seen before include "loses consciousness" , "Goes out" , "Dozes" , "Falls asleep" .)