Magical symbol — place ten around (8)
I believe the answer is:
pentacle
'magical symbol' is the definition.
(symbol used in witchcraft)
'place ten around' is the wordplay.
'around' indicates an anagram.
'place'+'ten'='placeten'
'placeten' with letters rearranged gives 'PENTACLE'.
(Other definitions for pentacle that I've seen before include "Mystic symbol" , "amulet" , "providing spirited defence?" , "Charm" , "Five-pointed star or other figure used as magic symbol" .)