Lucid (5)
'lucid' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for clear that I've seen before include "Unambiguous" , "Plain; unblock" , "Evident" , "Unobstructed" , "Patent" .)
'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" .)