Making sure to drop Regina in Cologne (4)
I believe the answer is:
musk
'making' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for musk that I've seen before include "Strong-smelling secretion used in perfumery - type of melon" , "Glandular secretion from a male deer, used in making perfume" , "Strong-smelling substance used in 9" , "Strong-smelling glandular secretion" , "Secretion from a male deer, used in perfumery" .)