Shout about international change initially relating to freezing (7)

I believe the answer is:

cryonic

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'initially relating to freezing' is the definition.
I can't tell whether this defines the answer.

'shout about international change' is the wordplay.
'shout' becomes 'cry' (synonyms).
'about' becomes 'on' (as in a book 'on' a certain topic).
'international change' becomes 'ic' (this could be a standard abbreviation of which I'm unaware).
'cry'+'on'+'ic'='CRYONIC'

Can you help me to learn more?

I've seen this clue in The Independent.

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