Write down almost everything? Never (3,2,3)
I believe the answer is:
not at all
'never' is the definition.
(thesaurus)
'write down almost everything?' is the wordplay.
'write down' becomes 'notate' (I've seen this in another clue).
'almost' means to remove the last letter (almost the whole word is kept).
'everything?' becomes 'all' (all things).
'notate' with its final letter taken away is 'notat'.
'notat'+'all'='NOT AT ALL'
(Other definitions for not at all that I've seen before include "forget it" , "Anything but!" , "You're welcome" , "denial" , "By no means - polite disclaimer" .)