This army so valiant in conflict (9)
I believe the answer is:
salvation
'this army' is the definition.
(Salvation Army)
'so valiant in conflict' is the wordplay.
'in conflict' indicates an anagram (I've seen this in other clues).
'so'+'valiant'='sovaliant'
'sovaliant' is an anagram of 'SALVATION'.
(Other definitions for salvation that I've seen before include "Redemption" , "Deliverance from evil" , "Help" , "Christian body noted for social work and bands" , "Preservation from evil" .)