The little pig's house of straw presumably is not made to last (12)

I believe the answer is:

destructible

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'last' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for destructible that I've seen is " Able to be demolished".)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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