You may fear to press this button (5)

I believe the answer is:

panic

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'press this button' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

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(Other definitions for panic that I've seen before include "Great consternation" , "Frenzy" , "Contagious fear" , "Sudden extreme anxiety" , "Grass" .)

I've seen this clue in the Evening Standard.

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