One, possibly nosy, causes displeasure (6)

I believe the answer is:

annoys

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

'one possibly nosy' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'possibly' indicates anagramming the letters.
'nosy' with letters rearranged gives 'noys'.
'an'+'noys'='ANNOYS'

Can you help me to learn more?

(Other definitions for annoys that I've seen before include "Irks, vexes" , "Irritates, vexes" , "'Irritates, irks (6)'" , "Harasses, pesters" , "Narks" .)

I've seen this clue in the Evening Standard.

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