Not rocket science when weapon's bound to fly off, airborne (2-7)
I believe the answer is:
no-brainer
'not rocket science when weapon's bound to fly off' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'airborne' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'airborne' is 'obrainer' which is located in the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for no-brainer that I've seen before include "An easy decision" , "Something requiring little or no mental effort" , "It's totally clear" , "Something involving little or no mental effort" , "Trivial problem" .)