Clear, transparent (6)

I believe the answer is:

limpid

I believe this clue is a double definition.

'clear' is the first definition.
(similar in meaning)

'transparent' is the second definition.
(synonyms)

(Other definitions for limpid that I've seen before include "Crystal clear, transparent" , "Crystal-clear" , "Completely clear" , "Calm" , "Translucent" .)

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

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