We read out a couple of letters (3,3,1)

I believe the answer is:

you and i

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

'we' is the definition.
(I've seen this before)

'out a couple of letters' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
'of' could be 'o' and 'o' is found in the answer.
This explanation may well be incorrect...

'read' acts as a link.

Can you help me to learn more?

(Another definition for you and i that I've seen is " We two".)

I've seen this clue in The Guardian.

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