Antidisestablishmentarianism not immediate? (4-4)

I believe the answer is:

long-term

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'not immediate?' is the definition.
(I've seen this before)

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

(Other definitions for long-term that I've seen before include "Enduring" , "Relating to a relatively extended period" , "Over a great time" , "Not immediate" .)

I've seen this clue in the Sydney Morning Herald.

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