Some irritating sound in my earhole? That does it! (6)

I believe the answer is:

annoys

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'does it' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for annoys that I've seen before include "Nettles" , "Narks" , "'Irritates, irks (6)'" , "is vexing" , "Bugs" .)

I've seen this clue in The Independent.

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