Being prepared, raids seen off (9)
I believe the answer is:
readiness
'being prepared' is the definition.
(I've seen this before)
'raids seen off' is the wordplay.
'off' is an anagram indicator.
'raids'+'seen'='raidsseen'
'raidsseen' anagrammed gives 'READINESS'.
(Other definitions for readiness that I've seen before include "initiative" , "Promptitude" , "Inclination" , "State of being prepared and willing" , "Immediate availability" .)