Protective charm (6)
I believe the answer is:
amulet
'protective charm' is the definition.
(I've seen this before)
This is the entire 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" .)