Take umbrage at a restraining device (6)

I believe the answer is:

bridle

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'device' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bridle that I've seen before include "Part of horse's harness that goes on its head" , "Become indignant" , "Bring under control" , "Headgear used to control a horse" , "Restrain" .)

I've seen this clue in The Irish News.

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