Crib most ideas going round - oddly that's ground breaking (7)

I believe the answer is:

seismic

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

'crib most' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for seismic that I've seen before include "Relating to earthquakes" , "Caused by an earthquake" , "massive" , "Earthshaking" , "Resulting from earthquakes" .)

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