How the issue is expected to develop (4,2)

I believe the answer is:

grow up

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'develop' is the definition.
(I know that grow up is a kind of grow)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grow up that I've seen before include "Be your age, acquire maturity" , "Develop, become mature" , "Become an adult" , "Become mature - or injunction to act like it?" , "Informal injunction to have sense, be mature" .)

I've seen this clue in The Globe and Mail.

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