Unfit so ousted (3,2,5)
I believe the answer is:
out of place
'unfit' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for out of place that I've seen before include "Not suited to the occasion" , "inappropriate" , "incongruous" , "needing to be elsewhere" .)