Aim at office worker on short time (7)
I believe the answer is:
attempt
'aim' is the definition.
(thesaurus)
'at office worker on short time' is the wordplay.
'office worker' becomes 'temp' (I've seen this before).
'on' says to put letters next to each other.
'short time' becomes 't' (abbreviation for time).
'at'+'temp'+'t'='ATTEMPT'
(Other definitions for attempt that I've seen before include "Tackle" , "Try to climb (a peak)" , "Try, hazard" , "Stab" , "Endeavor, try" .)