Post-it jotting (4)
I believe the answer is:
note
'post-it jotting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for note that I've seen before include "Crotchet or minim, say?" , "Record - piece of music" , "Reminder - fame - sound" , "Observe; paper money" , "Bill" .)