Most employees have to stop (4)
I believe the answer is:
stem
'stop' is the definition.
(stem can mean to stop or interrupt)
'most employees have' is the wordplay.
'have' indicates a hidden word.
'STEM' is hidden within 'most employees'.
'to' is the link.
(Other definitions for stem that I've seen before include "Restrain the flow of" , "Main upright of a ship's bow" , "Axis" , "Stalk - check" , "Staunch (flow)" .)