Regulates decoys changing hands (5)

I believe the answer is:

rules

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'hands' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for rules that I've seen before include "controls" , "following Queensberry?" , "Is king" , "is supreme, OK?" , "strips" .)

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