Hinder troublemaker editor initially employed (6)
I believe the answer is:
impede
'hinder' is the definition.
('impede' can be a synonym of 'hinder')
'troublemaker editor initially employed' is the wordplay.
'troublemaker' becomes 'imp' (I've seen this before).
'editor' becomes 'ed'.
'initially' says to take the initial letters.
The first letter of 'employed' is 'e'.
'imp'+'ed'+'e'='IMPEDE'
(Other definitions for impede that I've seen before include "Delay; block progress of" , "Hinder, inhibit" , "Hold back" , "Hinder, be obstructive" , "Hinder or delay" .)