Relating to earthquakes (7)

I think it could be either:

Which length description are you looking for?:

seismic

'relating to earthquakes' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for seismic that I've seen before include "earth-shattering effects?" , "Caused by an earthquake" , "Resulting from earthquakes" , "massive" , "shock" .)

I've seen this clue in The Times and The Telegraph.

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