School is a safe place in Ring perhaps from endless Internet trolls (8)

'ring perhaps from endless internet trolls' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'school is a safe place' is the wordplay.
I cannot quite understand how this works, but
'school' could be 's' and 's' is present in the answer.
'place' could be 'corner' (corner is a kind of place) and 'corner' is present in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?