Safeguard (10)
'safeguard' is the definition.
(I know that safeguard can be written as precaution)
This is all the clue.
(Other definitions for precaution that I've seen before include "Measure taken in case it proves to be necessary" , "Safety measure" , "Safeguard" , "foresight" , "Advance measure taken against an undesirable development" .)
'safeguard' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for defence that I've seen before include "Military's purpose" , "Protection from harm" , "Protection from danger" , "Evidence from the accused" , "A means of protecting from attack" .)
'safeguard' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ensure that I've seen before include "Make certain for the future" , "Make certain or safe" , "Make certain, secure" , "Make certain, confirm" , "Make certain (something will occur)" .)