Articles from Le Monde and the Guardian secure coverage of both sides of the moon (5)

I believe the answer is:

lunar

'of the moon' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for lunar that I've seen before include "Selenic" , "Belonging to the moon" , "Pertaining to the moon" , "Kind of eclipse" , "Of a natural satellite" .)

I've seen this clue in The Guardian.

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