Maltreated? Difficult, and beyond being repaired (4,4,2)
I believe the answer is:
hard done by
'maltreated?' is the definition.
(hard done by means badly treated)
'difficult and beyond being repaired' is the wordplay.
'difficult' becomes 'hard' (associated in meaning).
'and' says to put letters next to each other.
'being repaired' is an anagram indicator.
'beyond' with letters rearranged gives 'doneby'.
'hard'+'doneby'='HARD-DONE-BY'
(Other definitions for hard done by that I've seen before include "abused" , "Unfairly treated" .)