Bent on getting a strap fixed (7)

I believe the answer is:

buckled

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'bent' is the definition.
(I've seen this before)

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

(Other definitions for buckled that I've seen before include "folded under pressure" , "Crumpled under pressure." , "Fastened up - gave way" , "Bent" , "Securely fastened" .)

I've seen this clue in the Evening Standard.

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