Crossword Genius

Mother's suffering — residence ultimately needed? (4,4)

Ross

I believe the answer is:

rest home

But I can't explain it at all!

(Other definitions for rest home that I've seen before include "place to stay" , "place for the frail elderly" , "Place for the old" , "residence" , "old institution" .)

I've seen this clue in The Guardian.
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