Crossword Genius

Miss ice formation of huge proportions (7)

Ross

I believe the answer is:

seismic

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'miss ice formation of huge proportions' is the definition.
I can't judge whether this definition defines the answer.

'miss ice formation' is the wordplay.
'formation' is an anagram indicator.
'miss'+'ice'='missice'
'missice' is an anagram of 'SEISMIC'.

Can you help me to learn more?

(Other definitions for seismic that I've seen before include "earth-shattering effects?" , "Caused by an earthquake" , "Earthshaking" , "Of earth tremors" , "shock" .)

I've seen this clue in The Daily Express.
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