Take note of the editor (4)
I believe the answer is:
heed
'take note' is the definition.
'of the editor' is the wordplay.
'of' indicates a hidden word.
'HEED' is hidden in the letters of 'the editor'.
(Other definitions for heed that I've seen before include "Caution" , "Mark" , "Take note of" , "Careful attention" , "Consider" .)