Leave some complex items (4)
I believe the answer is:
exit
'leave' is the definition.
(I know that leave can be written as exit)
'some complex items' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'EXIT' is hidden in the letters of 'complex items'.
(Other definitions for exit that I've seen before include "Depart" , "Way out sign" , "Relinquish the lead" , "[DOOR] ?" , "Sudden rush of pleasure" .)