Annoys son — quite unnecessary (8)

I believe the answer is:

needless

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'quite unnecessary' is the definition.
'needless' can be an answer for 'unnecessary' (similar in meaning). I am not certain of the 'quite' bit.

'annoys son' is the wordplay.
'annoys' becomes 'needles' (I've seen this before).
'son' becomes 's'.
'needles'+'s'='NEEDLESS'

Can you help me to learn more?

(Other definitions for needless that I've seen before include "luxury" , "Excessive" , "Lessened, being without good cause" , "Unnecessary and unwarranted" , "Gratuitous" .)

I've seen this clue in The Hindu.

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