Crossword Genius

3s, for which one has permanent possession (5)

Ross

I believe the answer is:

keeps

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

'has permanent possession' is the definition.
'keeps' can be an answer for 'has' (keeping is a kind of having). I am not sure about the 'permanent possession' bit.

'3s for which one' is the wordplay.
I cannot quite understand how this works, but
'3s' could be 's' and 's' is found within the answer.
The remaining letters 'keep' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for keeps that I've seen before include "Stores" , "Retains" .)

I've seen this clue in The Guardian.
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