Forsake (7)
'forsake' is the definition.
(synonyms)
This is all the clue.
(Other definitions for abandon that I've seen before include "scrap" , "Czech city" , "Desert - it's wild" , "Junk" , "Wantonness: desert" .)
(Other definitions for neglect that I've seen before include "Fail to pay due attention to (7)" , "Disregard or fail to care for" , "Lack of due care and attention" , "Fail to take proper care of, be derelict" , "Omit by carelessness" .)