Short-term worker, for short (4)
I believe the answer is:
temp
'short-term worker for short' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for temp that I've seen before include "relief" , "Short-time worker" , "Non-full time employee" , "Transient office worker" , "Short-term office worker" .)