Ignored criminal taunted about death (10)
I believe the answer is:
unattended
'ignored' is the definition.
(thesaurus)
'criminal taunted about death' is the wordplay.
'criminal' indicates anagramming the letters.
'about' indicates putting letters inside.
'death' becomes 'end' ('end' can be a synonym of 'death').
'taunted' with letters rearranged gives 'unatted'.
'unatted' enclosing 'end' is 'UNATTENDED'.
(Other definitions for unattended that I've seen before include "not taking train" , "Not looked after" .)