Introduction to fanzine in vernal issue (9)

I believe the answer is:

offspring

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'issue' is the definition.
(I know that offspring is a type of issue)

'introduction to fanzine in vernal' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for offspring that I've seen before include "Child" , "Result" , "Progeny" , "Kids" , "Issue for raising" .)

I've seen this clue in The Daily Express.

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