Hire for work (6)
(Other definitions for employ that I've seen before include "Put to use" , "Use or take on" , "Give work to (person)" , "Take on - recruit" , "Engage or hire for work" .)
'hire for work' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for engage that I've seen before include "Recruit" , "Employ or get involved in battle" , "Employ or take on" , "Employ as a worker" , "start fighting" .)