Defiant words may see some miss other exit (2,5)
I believe the answer is:
so there
'defiant words' is the definition.
(I've seen this before)
'some miss other exit' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SO THERE' is hidden within 'miss other exit'.
'may see' is the link.
(Other definitions for so there that I've seen before include "Expression of defiance" , "I defy you" , "Expression of triumph, derision, etc" , "message of defiance" , "Defiant statement" .)