Active during the day (7)

I believe the answer is:

diurnal

'active during the day' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for diurnal that I've seen before include "in daylight" , "Happening daily" , "Circadian" , "Occurring daily" , "Of the day, not the night" .)

I've seen this clue in The Guardian, the Sydney Morning Herald, The Mirror, The New York Times and The Times.

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