Rule independence out, displaying military weapons (8)
I believe the answer is:
ordnance
'military weapons' is the definition.
(I've seen this in another clue)
'rule independence out' is the wordplay.
'rule' becomes 'ordinance' (ordinance can mean an order or rule).
'independence' becomes 'I'.
'out' indicates named letters should be taken away.
'ordinance' with 'i' taken away is 'ORDNANCE'.
'displaying' acts as a link.
(Other definitions for ordnance that I've seen before include "Car on end (anag) - artillery" , "weaponry" , "The Survey provides maps" , "Mounted guns, cannon" , "regulation" .)