Missing (6)
'missing' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for absent that I've seen before include "Not present - vacuous" , "Away" , "Not at a specified place" , "Not present or focused" , "Missing, lacking" .)
'missing' is the definition.
(something that's gone astray is missing)
This is the entire clue.
(Other definitions for astray that I've seen before include "(Gone) off course" , "(Gone) in wrong direction" , "Wandering, off course" , "Wandering lost" , "Go . . . . . . - get lost" .)
'missing' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for lost that I've seen before include "at sea" , "Mislaid or strayed" , "Not knowing one's whereabouts" , "Mislaid or irretrievable" , "Baffled" .)
'missing' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for gone that I've seen before include "Departed; used up" , "... saga of 2's civil war" , "No longer present" , "Departed, left" , "Departed or dead" .)
'missing' is the definition.
(I know that missing can be written as lacking)
This is all the clue.
(Other definitions for lacking that I've seen before include "Deficient or inadequate" , "Absent, deficient" , "'Deficient, wanting (7)'" , "Short" , "Being without, wanting" .)