The Rock guaranteed to beat this wrestler’s grip (8)

I believe the answer is:

scissors

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'grip' is the definition.
(I know that scissors is a type of wrestling hold)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scissors that I've seen before include "lock" , "Cutting instrument made of two joined blades with handles" , "Cross sis with two-bladed implement" , "Paper/fabric cutters" , "Wrestling hold" .)

I've seen this clue in the Sydney Morning Herald.

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