Leave out some random items (4)
I believe the answer is:
omit
'leave out' is the definition.
(I know that leave out can be written as omit)
'some random items' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'OMIT' can be found hidden inside 'random items'.
(Other definitions for omit that I've seen before include "Fail to include" , "Exclude; veto" , "Leave out or undone" , "Fail (to do something)" , "Leave something out" .)