Grab something that buckles, perhaps (6)

I believe the answer is:

collar

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'grab' is the definition.
(thesaurus)

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

(Other definitions for collar that I've seen before include "Be hot under the . . . . . . to be angry or resentful" , "Grab one" , "Grab by the neckband?" , "Part of a shirt or jacket" , "Arrest - part of garment" .)

I've seen this clue in the Evening Standard.

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