Bomber attribute (7)
I believe the answer is:
stealth
'bomber attribute' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stealth that I've seen before include "Cautious and surreptitious action or movement" , "Avoidance of detection by moving carefully" , "word to define secrecy" , "Low-visibility military technology" , "Kind of indirect tax" .)