Aborted mission words (2-2)
I believe the answer is:
no-go
'aborted mission words' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for no-go that I've seen before include "Prohibited area" , "Cancelled" , "Barricaded area" , "Can't be done, not on" , "Not possible, futile" .)