Some mispronounced names of genetic stuff
I believe the answer is:
dna
'genetic stuff' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'some mispronounced names' is the wordplay.
'dna' is hidden in amongst the letters.
However, I'm not sure how the hidden word is indicated.
'of' is the link.
(Other definitions for dna that I've seen before include "Genetic code" , "Substance that stores genetic information - often used by police" , "Substance in chromosomes that stores genetic data" , "Genetic-code molecule" , "Briefly, substance in chromosomes used by police to identify criminals" .)