Protective charm (6)
I believe the answer is:
amulet
'protective charm' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for amulet that I've seen before include "Trinket worn to protect one from evil" , "Mascot" , "Lucky charm, talisman" , "Charm worn against bad luck" , "Charm protecting against evil" .)