Protects some military hardware (7)
I believe the answer is:
shields
'protects' is the definition.
(shielding is a kind of protecting)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for shields that I've seen before include "Protects or hides from danger" , "Escutcheons" , "More than one buckler, maybe" .)