Defence (5)
'defence' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for guard that I've seen before include "Custodian" , "Protect(or)" , "Protection" , "One keeps watch" , "Yeomen" .)
'defence' is the definition.
(I know that rampart is a type of fortification)
This is all the clue.
(Other definitions for rampart that I've seen before include "Embankment built for defensive purposes" , "barricade" , "Broad defensive wall" , "Battlement, fortification" , "Defensive structure" .)