Marker to put symbol on sheep - part of occult ritual? (9)
I believe the answer is:
pentagram
'part of occult ritual?' is the definition.
(occult symbol)
'marker to put symbol on sheep' is the wordplay.
'marker' becomes 'pen' (marker pen).
'to put' says to put letters next to each other.
'symbol' becomes 'tag' (tag is a kind of symbol).
'on' means one lot of letters go next to another.
'sheep' becomes 'ram' (male sheep).
'pen'+'tag'+'ram'='PENTAGRAM'
(Other definitions for pentagram that I've seen before include "Five-pointed star" , "Star-shaped figure" , "Five pointed star" , "magical symbol" , "Mystical symbol" .)