Unsuitable and so dismissed (3,2,5)
I believe the answer is:
out of place
'unsuitable' is the definition.
(thesaurus)
'so dismissed' is the wordplay.
I cannot quite see how this works, but
'dismissed' could be 'out' (I've seen this before) and 'out' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for out of place that I've seen before include "Not suited to the occasion" , "incongruous" , "inappropriate" , "needing to be elsewhere" .)