Lucid (8)

I think it could be either:

Which length description are you looking for?:

rational

'lucid' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for rational that I've seen before include "Sane and sensible" , "Able to reason" , "Not absurd" , "Conforming to reason" , "Based on reason or logic" .)

I've seen this clue in The Guardian and The New York Times.

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