Quartet sees they're using disparaging form of address (4-4)

I believe the answer is:

four-eyes

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'using disparaging form of address' is the definition.
I can't judge whether this defines the answer.

'quartet sees' is the wordplay.
'quartet' becomes 'four' (synonyms).
'sees' becomes 'eyes' (I can't justify this - if you can you should believe this answer much more).
'four'+'eyes'='FOUR-EYES'

'they're' is the link.

Can you help me to learn more?

(Other definitions for four-eyes that I've seen before include "Rude term for a specs wearer" , "Derogatory word for one wearing spectacles" .)

I've seen this clue in The Irish Times.

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