Crossword Genius

All the same, these letters suggest a basic education (3,5,2)

Ross

I believe the answer is:

the three rs

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

'a basic education' is the definition.
(the three R's are reading, writing and arithmetic)

'all the same these letters suggest' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'the' is 'het' which is within the answer.
The remaining letters 'threers' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for the three rs that I've seen is " It's kids' stuff".)

I've seen this clue in The Telegraph.
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