It comes back frozen solid in a special container (3)
I believe the answer is:
ice
'frozen solid in a special container' is the definition.
'ice' can be an answer for 'frozen' (I've seen this in other clues). I'm unsure of the 'solid in a special container' bit.
'it comes back' is the wordplay.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'comes' becomes 'ci' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'back' shows that the letters should be reversed in order.
'e'+'ci'='eci'
'eci' backwards is 'ICE'.
Can you help me to learn more?
(Other definitions for ice that I've seen before include "Winter formation" , "Diamond" , "Cooler" , "Rocks on which drink is served?" , "Decorate with frosting" .)