Make case to contain echo (6)
I believe the answer is:
create
'make' is the definition.
(I know that make can be written as create)
'case to contain echo' is the wordplay.
I cannot quite understand how this works, but
'echo' could be 'e' (phonetic alphabet: alpha, bravo, charlie etc.) and 'e' is found within the answer.
'case' could be 'crate' (crating is a kind of casing) and 'crate' is located in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for create that I've seen before include "Bring into existence" , "Make, Porduce" , "found" , "Design" , "Build" .)