Crossword Genius

Di not Jo's written in diary every day (7)

Ross

I believe the answer is:

diurnal

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

'di not' is the wordplay.
'not' becomes 'urnal' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'di'+'urnal'='DIURNAL'

'jo's written in diary' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

(Other definitions for diurnal that I've seen before include "in daylight" , "I run lad in daily mode, not nocturnal" , "every day" , "Occurring daily" , "Active during the day" .)

I've seen this clue in The Guardian.
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