Neglected bust eroding (7)
I believe the answer is:
ignored
'neglected' is the definition.
(I know that neglected can be written as ignored)
'bust eroding' is the wordplay.
'bust' is an anagram indicator.
'eroding' is an anagram of 'IGNORED'.
(Other definitions for ignored that I've seen before include "overlooked" , "Turned a blind eye to" , "Snubbed" , "Shunned" , "Failed to notice" .)