Emmer product aliens manufactured around Missouri (8)
I believe the answer is:
semolina
'emmer product' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'aliens manufactured around missouri' is the wordplay.
'manufactured' indicates anagramming the letters.
'around' indicates putting letters inside.
'missouri' becomes 'mo'.
'aliens' anagrammed gives 'selina'.
'selina' going around 'mo' is 'SEMOLINA'.
Can you help me to learn more?
(Other definitions for semolina that I've seen before include "Part of wheat used in puddings" , "Type of milk pudding" , "Wheat product used in pasta" , "sweet" , "Hard particles of wheat used in puddings etc" .)