One editor has requirement (4)
I believe the answer is:
need
'requirement' is the definition.
(I know that need is a type of requirement)
'one editor has' is the wordplay.
'has' indicates the answer is hidden within the clue.
'NEED' is hidden within 'one editor'.
(Other definitions for need that I've seen before include "Require; want" , "Require (as essential)" , "Rely on" , "Necessity" , "state of distress" .)