Maltreat (3-3)
'maltreat' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for ill-use that I've seen before include "Mistreatment" , "Mistreat" , "Maltreatment" , "Treat cruelly - abuse" , "Treat badly or cruelly" .)
'maltreat' is the definition.
(synonyms)
This is all the clue.
(Other definitions for abuse that I've seen before include "vilification" , "Maltreat" , "Treat badly; insult" , "Mistreat" , "Treat badly - hurl insults" .)