Greek ferry operator casts anchor (6)
I believe the answer is:
charon
'greek ferry operator' is the definition.
The definition suggests a singular noun which matches the answer.
'casts anchor' is the wordplay.
'casts' indicates anagramming the letters (cast can mean to mould or shape).
'anchor' is an anagram of 'CHARON'.
Can you help me to learn more?
(Other definitions for charon that I've seen before include "Operator of late ferry" , "Boatman across the river Styx" , "Nineteen across of Pluto; Styx ferryman; anchor (anag.)" , "Mythical boatman of the River Styx" , "Ferryman of dead (Gk. myth)" .)