Poor treatment partly makes us immigrants rise (6)
I believe the answer is:
misuse
'poor treatment' is the definition.
(misuse is treating someone badly)
'partly makes us immigrants rise' is the wordplay.
'partly' indicates a hidden word (part of the clue is used).
'rise' says the letters should be written backwards.
'esusim' can be found hidden inside 'makes us immigrants'.
'esusim' written backwards gives 'MISUSE'.
(Other definitions for misuse that I've seen before include "Put to the wrong purpose" , "harm" , "Mistreat, misapply" , "bad practice" , "bad treatment" .)