Gardens unusual peril (6)

I believe the answer is:

danger

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'peril' is the definition.
(I know that peril can be written as danger)

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

Can you help me to learn more?

(Other definitions for danger that I've seen before include "Ranged about in some peril" , "Garden (anag) - peril" , "Insecurity" , "Menace" , "Peril, threat" .)

I've seen this clue in The Mirror.

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