You’ll admit there’s nothing in demolishing a wall (5)

I believe the answer is:

allow

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'wall' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how they can define each other.

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

Can you help me to learn more?

(Other definitions for allow that I've seen before include "Tolerate" , "Give permission to" , "Acknowledge - concede" , "Admit as acceptable" , "praise no more" .)

I've seen this clue in the Evening Standard.

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