Crossword Genius

Calm and collected announcement of educational establishment in 'ackney? (3-4)

Ross

I believe the answer is:

ice-cool

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

'educational establishment in 'ackney?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'calm and collected announcement' is the wordplay.
'calm' becomes 'cool' (cool is a kind of calm).
'and' says to put letters next to each other.
'collected announcement' becomes 'ice' (I can't justify this - if you can you should believe this answer much more).
'cool' after 'ice' is 'ICE-COOL'.

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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