Food processor from Yemen, unfortunately with unknown content (6)
I believe the answer is:
enzyme
'food processor' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'yemen unfortunately with unknown content' is the wordplay.
'unfortunately' indicates anagramming the letters.
'with unknown' becomes 'z' (algebra. I am not sure about the 'with' bit.).
'content' means one lot of letters goes inside another.
'yemen' is an anagram of 'enyme'.
'enyme' going around 'z' is 'ENZYME'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for enzyme that I've seen before include "causing ferment" , "One causing a reaction" , "Substance created in living cells acting as a catalyst" , "E.g. pepsin" , "Protein acting as a catalyst in biochemical reactions" .)