Recall some Halloween ogres no longer with us (4)
I believe the answer is:
gone
'no longer with us' is the definition.
'recall some halloween ogres' is the wordplay.
'recall' says the letters should be written in reverse (I've seen 'recalled' mean this).
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'enog' can be found hidden inside 'halloween ogres'.
'enog' written backwards gives 'GONE'.
(Other definitions for gone that I've seen before include "Departed or dead" , "Departed, left" , "Well in the past" , "... saga of 2's civil war" , "Departed, disappeared" .)