Seems angered - but not by the close shave (8)

I believe the answer is:

bristles

I'm a little stuck... Click here to teach me more about this clue!

'seems' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how one could define the other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for bristles that I've seen is " Blisters with short stiff hairs".)

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