Mobster, I learn, essentially unable to create issue (7)
I believe the answer is:
sterile
'unable to create issue' is the definition.
I can't tell whether this definition defines the answer.
'mobster i learn essentially' is the wordplay.
'essentially' indicates a hidden word (essence can mean the inside of something).
'STERILE' is hidden within 'mobster i learn'.
Can you help me to learn more?
(Other definitions for sterile that I've seen before include "Incapable of reproducing" , "Barren" , "Unable to produce young" , "Lab so clean" , "unable to reproduce results" .)